Is there an easy way to check the NET Framework version

Question

The problem is that I need to know if it s version 3 5 SP 1  Environment Version   only returns 2 0 50727 3053   I found this solution  but I think it will take much more time than it s worth  so I m looking for a simpler one  Is it possible

User · Answer

It used to be easy  but Microsoft decided to make a breaking change  Before version 4 5  each version of  NET resided in its own directory below C  Windows Microsoft NET Framework  subdirectories v1 0 3705  v1 1 4322  v2 0 50727  v3 0  v3 5 and v4 0 30319    Since version 4 5 this has been changed  Each version of  NET  i e  4 5 x  4 6 x  4 7 x  4 8 x       is being installed in the same subdirectory v4 0 30319 - so you are no longer able to check the installed  NET version by looking into Microsoft NET Framework  To check the  NET version  Microsoft has provided two different sample scripts depending on the  NET version that is being checked  but I don t like having two different C  scripts for this  So I tried to combine them into one  here s the script GetDotNetVersion cs I created  and updated it for 4 7 1 framework   using System  using Microsoft Win32  public class GetDotNetVersion       public static void Main string   args                Console WriteLine  args    null  amp  amp  args Length  gt  0                                quot Command line arguments   quot    string Join  quot   quot   args                                quot  quot             string maxDotNetVersion   GetVersionFromRegistry            if  String Compare maxDotNetVersion   quot 4 5 quot    gt   0                        string v45Plus   GetDotNetVersion Get45PlusFromRegistry                if  v45Plus     quot  quot   maxDotNetVersion   v45Plus                    Console WriteLine  quot     Maximum  NET version number found is   quot    maxDotNetVersion    quot     quot               private static string Get45PlusFromRegistry                 String dotNetVersion    quot  quot           const string subkey     quot SOFTWARE Microsoft NET Framework Setup NDP v4 Full  quot           using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey subkey                         if  ndpKey    null  amp  amp  ndpKey GetValue  quot Release quot      null                                dotNetVersion   CheckFor45PlusVersion  int ndpKey GetValue  quot Release quot                     Console WriteLine  quot  NET Framework Version   quot    dotNetVersion                             else                               Console WriteLine  quot  NET Framework Version 4 5 or later is not detected  quot                                    return dotNetVersion                Checking the version using  gt   will enable forward compatibility      private static string CheckFor45PlusVersion int releaseKey                if  releaseKey  gt   528040  return  quot 4 8 or later quot           if  releaseKey  gt   461808  return  quot 4 7 2 quot           if  releaseKey  gt   461308  return  quot 4 7 1 quot           if  releaseKey  gt   460798  return  quot 4 7 quot           if  releaseKey  gt   394802  return  quot 4 6 2 quot           if  releaseKey  gt   394254  return  quot 4 6 1 quot           if  releaseKey  gt   393295  return  quot 4 6 quot           if   releaseKey  gt   379893   return  quot 4 5 2 quot           if   releaseKey  gt   378675   return  quot 4 5 1 quot           if   releaseKey  gt   378389   return  quot 4 5 quot               This code should never execute  A non-null release key should mean            that 4 5 or later is installed          return  quot No 4 5 or later version detected quot              private static string GetVersionFromRegistry                 String maxDotNetVersion    quot  quot              Opens the registry key for the  NET Framework entry          using  RegistryKey ndpKey   RegistryKey OpenRemoteBaseKey RegistryHive LocalMachine   quot  quot                                            OpenSubKey   quot SOFTWARE Microsoft NET Framework Setup NDP  quot                             As an alternative  if you know the computers you will query are running  NET Framework 4 5                 or later  you can use                 using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine                  RegistryView Registry32  OpenSubKey   quot SOFTWARE Microsoft NET Framework Setup NDP  quot                foreach  string versionKeyName in ndpKey GetSubKeyNames                                  if  versionKeyName StartsWith  quot v quot                                          RegistryKey versionKey   ndpKey OpenSubKey versionKeyName                       string name    string versionKey GetValue  quot Version quot    quot  quot                        string sp   versionKey GetValue  quot SP quot    quot  quot   ToString                        string install   versionKey GetValue  quot Install quot    quot  quot   ToString                        if  install     quot  quot     no install info  must be later                                                Console WriteLine versionKeyName    quot    quot    name                           if  String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                            else                                               if  sp     quot  quot   amp  amp  install     quot 1 quot                                                         Console WriteLine versionKeyName    quot    quot    name    quot   SP quot    sp                               if  String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                                                       if  name     quot  quot                                                 continue                                            foreach  string subKeyName in versionKey GetSubKeyNames                                                  RegistryKey subKey   versionKey OpenSubKey subKeyName                           name    string subKey GetValue  quot Version quot    quot  quot                            if  name     quot  quot                                                         sp   subKey GetValue  quot SP quot    quot  quot   ToString                                                      install   subKey GetValue  quot Install quot    quot  quot   ToString                            if  install     quot  quot                                                           no install info  must be later                              Console WriteLine versionKeyName    quot    quot    name                               if  String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                                    else                                                       if  sp     quot  quot   amp  amp  install     quot 1 quot                                                                 Console WriteLine  quot    quot    subKeyName    quot    quot    name    quot   SP quot    sp                                   if  String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                                            else if  install     quot 1 quot                                                                 Console WriteLine  quot    quot    subKeyName    quot    quot    name                                   if  String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                   if                              if                          for                      if                  foreach              using         return maxDotNetVersion                  class  On my machine it outputs    v2 0 50727  2 0 50727 4927  SP2 v3 0  3 0 30729 4926  SP2 v3 5  3 5 30729 4926  SP1 v4    Client  4 7 03056  Full  4 7 03056 v4 0    Client  4 0 0 0  NET Framework Version  4 7 2 or later      Maximum  NET version number found is  4 7 2 or later        The only thing that needs to be maintained over time is the build number once a  NET version greater than 4 7 1 comes out - that can be done easily by modifying the function CheckFor45PlusVersion  you need to know the release key for the new version then you can add it  For example  if  releaseKey  gt   461308  return  quot 4 7 1 or later quot    This release key is still the latest one and valid for the Fall Creators update of Windows 10  If you re still running other  older  Windows versions  there is another one as per this documentation from Microsoft    NET Framework 4 7 1 installed on all other Windows OS versions    461310  So  if you need that as well  you ll have to add if  releaseKey  gt   461310  return  quot 4 7 1 or later quot    to the top of the function CheckFor45PlusVersion  Likewise it works for newer versions  For example  I have added the check for 4 8 recently  You can find those build numbers usually at Microsoft   Note  You don t need Visual Studio to be installed  not even PowerShell - you can use csc exe to compile and run the script above  which I have described here   Update  The question is about the  NET Framework  for the sake of completeness I d like to mention how to query the version of  NET Core as well - compared with the above  that is easy  Open a command shell and type   dotnet --info Enter  and it will list the  NET Core version number  the Windows version and the versions of each related runtime DLL as well  Sample output    NET Core SDK  reflecting any global json       Version    2 1 300     Commit     adab45bf0c  Runtime Environment      OS Name      Windows     OS Version   10 0 15063     OS Platform  Windows     RID          win10-x64     Base Path    C  Program Files dotnet sdk 2 1 300  Host  useful for support       Version  2 1 0     Commit   caa7b7e2ba   NET Core SDKs installed      1 1 9  C  Program Files dotnet sdk      2 1 102  C  Program Files dotnet sdk              2 1 300  C  Program Files dotnet sdk    NET Core runtimes installed      Microsoft AspNetCore All 2 1 0  C  Program     Files dotnet shared Microsoft AspNetCore All              Microsoft NETCore App 2 1 0  C  Program Files dotnet shared Microsoft NETCore App   To install additional  NET Core runtimes or SDKs      https   aka ms dotnet-download  Note that  if you only need the version number without all the additional information  you can use dotnet --version   on a 64 bit Windows PC  it is possible to install the x86 version side by side with the x64 version of  NET Core  If that is the case  you will only get the version that comes first in the environment variable PATH  That is especially important if you need to keep it up to date and want to know each version  To query both versions  use     C  Program Files dotnet dotnet exe --version 3 0 100-preview6-012264 C  Program Files  x86  dotnet dotnet exe --version 3 0 100-preview6-012264  In the example above  both are the same  but if you forgot to update both instances  you might get different results  Note that Program Files is for the 64bit version  and Program Files  x86  is the 32bit version   Update  If you prefer to keep the build numbers in a list rather than in a cascade of if-statements  as Microsoft suggested   then you can use this code for CheckFor45PlusVersion instead  private static string CheckFor45PlusVersion int releaseKey        var release   new Dictionary lt int  string gt                        378389   quot 4 5 quot                   378675   quot 4 5 1 quot       379893   quot 4 5 2 quot                   393295   quot 4 6 quot                   394254   quot 4 6 1 quot       394802   quot 4 6 2 quot                   460798   quot 4 7 quot                   461308   quot 4 7 1 quot       461808   quot 4 7 2 quot                   528040   quot 4 8 or later quot               int result   -1      foreach var k in release OrderBy k  gt k Key                 if  k Key  lt   releaseKey  result   k Key  else break             return  result  gt  0    release result     quot No 4 5 or later version detected quot

User · Answer

Something like this should do it  Just grab the value from the registry  For  NET 1-4   Framework is the highest installed version  SP is the service pack for that version   RegistryKey installed versions   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP    string   version names   installed versions GetSubKeyNames      version names start with  v   eg   v3 5  which needs to be trimmed off before conversion double Framework   Convert ToDouble version names version names Length - 1  Remove 0  1   CultureInfo InvariantCulture   int SP   Convert ToInt32 installed versions OpenSubKey version names version names Length - 1   GetValue  SP   0      For  NET 4 5   from official documentation    using System  using Microsoft Win32          private static void Get45or451FromRegistry         using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                int releaseKey   Convert ToInt32 ndpKey GetValue  Release             if  true                Console WriteLine  Version      CheckFor45DotVersion releaseKey                                 Checking the version using  gt   will enable forward compatibility       however you should always compile your code on newer versions of     the framework to ensure your app works the same   private static string CheckFor45DotVersion int releaseKey        if  releaseKey  gt   461808            return  4 7 2 or later             if  releaseKey  gt   461308            return  4 7 1 or later             if  releaseKey  gt   460798            return  4 7 or later             if  releaseKey  gt   394802            return  4 6 2 or later             if  releaseKey  gt   394254            return  4 6 1 or later             if  releaseKey  gt   393295            return  4 6 or later             if  releaseKey  gt   393273            return  4 6 RC or later             if   releaseKey  gt   379893             return  4 5 2 or later             if   releaseKey  gt   378675             return  4 5 1 or later             if   releaseKey  gt   378389             return  4 5 or later                This line should never execute  A non-null release key should mean         that 4 5 or later is installed       return  No 4 5 or later version detected

User · Answer

Little large  but looks like it is up-to-date to Microsoft oddities       public static class Versions               static Version               NET           static SortedList lt String Version gt               NETInstalled    if NET40  else         public static bool VersionTry String S  out Version V                        try                                V new Version S                    return true                            catch                               V null                  return false                           endif         const string  NetFrameWorkKey    SOFTWARE  Microsoft  NET Framework Setup  NDP           static void FillNetInstalled                         if   NETInstalled    null                                 NETInstalled   new SortedList lt String  Version gt  StringComparer InvariantCultureIgnoreCase                   RegistryKey                     frmks   Registry LocalMachine OpenSubKey  NetFrameWorkKey                   string                       names   frmks GetSubKeyNames                    foreach  string name in names                                        if  name StartsWith  v   StringComparison InvariantCultureIgnoreCase   amp  amp  name Length  gt  1                                                string                             f  vs                          Version                             v                          vs   name Substring 1                           if  vs IndexOf       lt  0                              vs      0    if NET40                         if  Version TryParse vs  out v    else                         if  VersionTry vs  out v    endif                                                       f   String Format   0   1    v Major  v Minor    if NET40                             if  Version TryParse  string frmks OpenSubKey name  GetValue  Version    out v    else                             if  VersionTry  string frmks OpenSubKey name  GetValue  Version    out v    endif                                                               if    NETInstalled ContainsKey f     v CompareTo  NETInstalled f    gt  0                                       NETInstalled f    v                                                            else                                  parse variants                                 Version                                     best   null                                  if   NETInstalled ContainsKey f                                       best    NETInstalled f                                   string                                       varieties   frmks OpenSubKey name  GetSubKeyNames                                    foreach  string variety in varieties   if NET40                                     if  Version TryParse  string frmks OpenSubKey name          variety  GetValue  Version    out v    else                                     if  VersionTry  string frmks OpenSubKey name          variety  GetValue  Version    out v    endif                                                                               if  best    null    v CompareTo best   gt  0                                                                                         NETInstalled f    v                                              best   v                                                                                    vs   f         variety                                          if    NETInstalled ContainsKey vs     v CompareTo  NETInstalled vs    gt  0                                               NETInstalled vs    v                                                                                                                                                                   static void FillNetInstalled            public static Version NETInstalled                       get                               FillNetInstalled                    return  NETInstalled  NETInstalled Keys  NETInstalled Count-1                               NETInstalled          public static Version NET                       get                               FillNetInstalled                    string                     clr   String Format   0   1    Environment Version Major  Environment Version Minor                   Version                     found    NETInstalled  NETInstalled Keys  NETInstalled Count-1                    if  NETInstalled ContainsKey clr                       return  NETInstalled clr                    for  int i    NETInstalled Count - 1  i  gt   0  i--                      if   NETInstalled Keys i  CompareTo clr   lt  0                          return found                      else                         found    NETInstalled  NETInstalled Keys i                    return found                             NET

User · Answer

Thank you for this post which was quite useful  I had to tweak it a little in order to check for framework 2 0 because the registry key cannot be converted straightaway to a double  Here is the code   string   version names   rk GetSubKeyNames      version names start with  v   eg   v3 5    we also need to take care of strings like v2 0 50727    string sCurrent   version names version names Length - 1  Remove 0  1   if  sCurrent LastIndexOf       gt  1        string   sSplit   sCurrent Split           sCurrent   sSplit 0          sSplit 1    sSplit 2     double dCurrent   Convert ToDouble sCurrent  System Globalization CultureInfo InvariantCulture   double dExpected   Convert ToDouble sExpectedVersion   if  dCurrent  gt   dExpected

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As of version 4 5 Microsoft changed the way it stores the  NET Framework indicator in the registry  There official guidance on how to retrieve the  NET framework and the CLR versions can be found here  https   msdn microsoft com en-us library hh925568 v vs 110  aspx  I am including modified version of their code to address the bounty question of how you determine the  NET framework for 4 5 and higher here   using System  using System Reflection  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using Microsoft Win32   namespace stackoverflowtesting       class Program               static void Main string   args                        Dictionary lt int  String gt  mappings   new Dictionary lt int  string gt                  mappings 378389     4 5               mappings 378675     4 5 1 on Windows 8 1               mappings 378758     4 5 1 on Windows 8  Windows 7 SP1  and Vista               mappings 379893     4 5 2               mappings 393295     4 6 on Windows 10               mappings 393297     4 6 on Windows not 10                using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                                    int releaseKey   Convert ToInt32 ndpKey GetValue  Release                     if  true                                        Console WriteLine  Version      mappings releaseKey                                                int a   Console Read

User · Answer

Environment Version   is giving the correct answer for a different question  The same version of the CLR is used in  NET 2 0  3  and 3 5  I suppose you could check the GAC for libraries that were added in each of those subsequent releases

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You can get a useful string without having to touch the registry or reference assemblies which may or may not be loaded   mscorlib dll and other System assemblies have AssemblyFileVersionAttribute defined  and it seems to be unique for each version of  NET  based on the reference assemblies provided with Visual Studio  string version    typeof string  Assembly      GetCustomAttributes typeof AssemblyFileVersionAttribute   false       FirstOrDefault   as AssemblyFileVersionAttribute   Version   Version 4 5 is a bit off  because it s marked 4 0 in that version  but 4 6 onward appear to have the minor version matching at least   Doing it this way seems like it would be more future proof than depending on some installer registry key and having to compare against a fixed set of values  I found the reference assemblies here  C  Program Files  x86  Reference Assemblies Microsoft Framework  NETFramework  Where I got the following versions  4 0   4 0 30319 1 4 5   4 0 30319 18020 4 5 1   4 0 30319 18402 4 5 2   4 0 30319 34211 4 6   4 6 81 0 4 6 1   4 6 1055 0 4 7 2   4 7 3062 0 4 8   4 8 3761 0

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I had a situation where my  NET 4 0 class library might be called from an  NET 4 0 or higher version assemblies   A specific method call would only work if executed from an 4 5  assembly   In Order to decide if I should call the method or not I needed to determine the current executing framework version and this is a pretty good solution for that  var frameworkName   new System Runtime Versioning FrameworkName      AppDomain CurrentDomain SetupInformation TargetFrameworkName     if  frameworkName Version  gt   new Version 4  5             run code

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An alternative method where no right to access the registry are needed  is to check for the existence of classes that are introduced in specific framework updates   private static bool Is46Installed            API changes in 4 6  https   github com Microsoft dotnet blob master releases net46 dotnet46-api-changes md     return Type GetType  System AppContext  mscorlib  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089   false     null     private static bool Is461Installed            API changes in 4 6 1  https   github com Microsoft dotnet blob master releases net461 dotnet461-api-changes md     return Type GetType  System Data SqlClient SqlColumnEncryptionCngProvider  System Data  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089   false     null     private static bool Is462Installed            API changes in 4 6 2  https   github com Microsoft dotnet blob master releases net462 dotnet462-api-changes md     return Type GetType  System Security Cryptography AesCng  System Core  Version 4 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089   false     null     private static bool Is47Installed            API changes in 4 7  https   github com Microsoft dotnet blob master releases net47 dotnet47-api-changes md     return Type GetType  System Web Caching CacheInsertOptions  System Web  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a   false     null

User · Answer

AFAIK there s no built in method in the framework that will allow you to do this  You could check this post for a suggestion on determining framework version by reading windows registry values

User · Answer

Try this one   string GetFrameWorkVersion                 return System Runtime InteropServices RuntimeEnvironment GetSystemVersion

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I tried to combine all the answers into a single whole   Using   NetFrameworkUtilities GetVersion   will return the currently available Version of the  NET Framework at this time or null if it is not present   This example works in  NET Framework versions 3 5   It does not require administrator rights   I want to note that you can check the version using the operators  lt  and   like this   var version   NetFrameworkUtilities GetVersion    if  version    null  amp  amp  version  lt  new Version 4  5         MessageBox Show  Your  NET Framework version is less than 4 5        Code   using System  using System Linq  using Microsoft Win32   namespace Utilities       public static class NetFrameworkUtilities               public static Version GetVersion     gt  GetVersionHigher4      GetVersionLowerOr4             private static Version GetVersionLowerOr4                         using  var key   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                                  var names   key  GetSubKeyNames                       version names start with  v   eg   v3 5  which needs to be trimmed off before conversion                 var text   names  LastOrDefault    Remove 0  1                   if  string IsNullOrEmpty text                                         return null                                     return text Contains                            new Version text                        new Version Convert ToInt32 text   0                                    private static Version GetVersionHigher4                         using  var key   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v4 Full                                  var value   key  GetValue  Release                    if  value    null                                        return null                                        Checking the version using  gt   will enable forward compatibility                       however you should always compile your code on newer versions of                     the framework to ensure your app works the same                   var releaseKey   Convert ToInt32 value                   if  releaseKey  gt   461308  return new Version 4  7  1                   if  releaseKey  gt   460798  return new Version 4  7                   if  releaseKey  gt   394747  return new Version 4  6  2                   if  releaseKey  gt   394254  return new Version 4  6  1                   if  releaseKey  gt   381029  return new Version 4  6                   if  releaseKey  gt   379893  return new Version 4  5  2                   if  releaseKey  gt   378675  return new Version 4  5  1                   if  releaseKey  gt   378389  return new Version 4  5                       This line should never execute  A non-null release key should mean                     that 4 5 or later is installed                   return new Version 4  5

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public static class DotNetHelper       public static Version InstalledVersion               get                       string framework   null               try                               using  var ndpKey               Registry LocalMachine OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                                            if  ndpKey    null                                                var releaseKey   ndpKey GetValue  Release                            if  releaseKey    null                                                        framework   CheckFor45PlusVersion Convert ToInt32 releaseKey                                                      else                                                       string   versionNames   null                              using  var installedVersions                                   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                                                                  if  installedVersions    null  versionNames   installedVersions GetSubKeyNames                                                                try                                                               if  versionNames    null  amp  amp  versionNames Length  gt  0                                                                        framework   versionNames versionNames Length - 1  Remove 0  1                                                                                               catch  FormatException                                                                                                                                                           catch  SecurityException                                           return framework    null   new Version framework    null                       private static string CheckFor45PlusVersion int releaseKey                if  releaseKey  gt   460798              return  4 7           if  releaseKey  gt   394802              return  4 6 2           if  releaseKey  gt   394254              return  4 6 1           if  releaseKey  gt   393295              return  4 6           if  releaseKey  gt   379893              return  4 5 2           if  releaseKey  gt   378675              return  4 5 1              This code should never execute  A non-null release key should mean            that 4 5 or later is installed          return releaseKey  gt   378389    4 5    null

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I find it easier to work with the Version class   using Microsoft Win32  using System Runtime InteropServices   namespace System Runtime InteropServices     public static class RuntimeInformationEx        public static Version  GetDotnetFrameworkVersion           using var key   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v4 Full          if  key is object            if   Int32 TryParse key GetValue  Release       ToString    out var release   return null          return release switch                     378389   gt  new Version 4  5  0             378675   gt  new Version 4  5  1             378758   gt  new Version 4  5  1             379893   gt  new Version 4  5  2             393295   gt  new Version 4  6  0             393297   gt  new Version 4  6  0             394254   gt  new Version 4  6  1             394271   gt  new Version 4  6  1             394802   gt  new Version 4  6  2             394806   gt  new Version 4  6  2             460798   gt  new Version 4  7  0             460805   gt  new Version 4  7  0             461308   gt  new Version 4  7  1             461310   gt  new Version 4  7  1             461808   gt  new Version 4  7  2             461814   gt  new Version 4  7  2             528040   gt  new Version 4  8  0             528209   gt  new Version 4  8  0             528049   gt  new Version 4  8  0                 gt  null                     else       NET version  lt  4 5         using var key1   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP            if  key1 is null  return null          var parts   key1 GetSubKeyNames    1  Substring 1  Split          get lastsub key  remove  v  prefix  and split         if  parts Length    2  parts   new string     parts 0   parts 1    0             if  parts Length    3  return null          Func lt string  int gt  Parse   s   gt  Int32 TryParse s  out var i    i   -1          try   return new Version Parse parts 0    Parse parts 1    Parse parts 2       catch   return null                       public static Version  GetDotnetCoreVersion           if   RuntimeInformation FrameworkDescription StartsWith   NET Core     return null        var parts   RuntimeInformation FrameworkDescription Substring 10  Split             if  parts Length    2  parts   new string     parts 0   parts 1    0           if  parts Length    3  return null        Func lt string  int gt  Parse   s   gt  Int32 TryParse s  out var i    i   -1        try   return new Version Parse parts 0    Parse parts 1    Parse parts 2       catch   return null                   code is C 8

User · Answer

If your machine is connected to the internet  going to smallestdotnet  downloading and executing the  NET Checker is probably the easiest way    If you need the actual method to deterine the version look at its source on github  esp  the Constants cs which will help you for  net 4 5 and later  where the Revision part is the relvant one                                int MinValue   4 5                                  378389   4 5                                  378675   4 5 1                                  378758   4 5 1                                  379893   4 5 2                                  381029   4 6 Preview                                  393273   4 6 RC1                                  393292   4 6 RC2                                  393295   4 6                                  393297   4 6                                  394254   4 6 1                                  394271   4 6 1                                  394747   4 6 2 Preview                                  394748   4 6 2 Preview                                  394757   4 6 2 Preview                                  394802   4 6 2                                  394806   4 6 2

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This is the solution I landed on   private static string GetDotNetVersion       var v4    string Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v4 Full   false   GetValue  Version      if v4    null      return v4    var v35    string Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v3 5   false   GetValue  Version      if v35    null      return v35    var v3    string Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v3 0   false   GetValue  Version      return v3      lt  3

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Update with  NET 4 6 2  Check Release value in the same registry as in previous responses   RegistryKey registry key   Registry LocalMachine OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP v4 Full    if  registry key    null      return false  var val   registry key GetValue  Release   0   UInt32 Release   Convert ToUInt32 val    if  Release  gt   394806     4 6 2 installed on all other Windows  different than Windows 10                  return true  if  Release  gt   394802     4 6 2 installed on Windows 10 or later                 return true

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public class DA       public static class VersionNetFramework               public static string GetVersion                         return Environment Version ToString                      public static string GetVersionDicription                         int Major   Environment Version Major              int Minor   Environment Version Minor              int Build   Environment Version Build              int Revision   Environment Version Revision                 http   dzaebel net NetVersionen htm               http   stackoverflow com questions 12971881 how-to-reliably-detect-the-actual-net-4-5-version-installed                4 0 30319 42000    NET 4 6 on Windows 8 1 64 - bit             if   Major  gt  4   amp  amp   Minor  gt  0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   42000                   return    NET 4 6 on Windows 8 1 64 - bit or later                 4 0 30319 34209    NET 4 5 2 on Windows 8 1 64 - bit             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   34209                   return    NET 4 5 2 on Windows 8 1 64 - bit or later                 4 0 30319 34209    NET 4 5 2 on Windows 7 SP1 64 - bit             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   34209                   return    NET 4 5 2 on Windows 7 SP1 64 - bit or later                 4 0 30319 34014    NET 4 5 1 on Windows 8 1 64 - bit             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   34014                   return    NET 4 5 1 on Windows 8 1 64 - bit or later                 4 0 30319 18444    NET 4 5 1 on Windows 7 SP1 64 - bit with MS14 - 009 security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   18444                   return    NET 4 5 1 on Windows 7 SP1 64 - bit with MS14 - 009 security update  or later                 4 0 30319 18408    NET 4 5 1 on Windows 7 SP1 64 - bit             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   18408                   return    NET 4 5 1 on Windows 7 SP1 64 - bit or later                 4 0 30319 18063    NET 4 5 on Windows 7 SP1 64 - bit with MS14 - 009 security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   18063                   return    NET 4 5 on Windows 7 SP1 64 - bit with MS14 - 009 security update  or later                 4 0 30319 18052    NET 4 5 on Windows 7 SP1 64 - bit             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   18052                   return    NET 4 5 on Windows 7 SP1 64 - bit or later                 4 0 30319 18010    NET 4 5 on Windows 8             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   18010                   return    NET 4 5 on Windows 8 or later                 4 0 30319 17929    NET 4 5 RTM             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   17929                   return    NET 4 5 RTM or later                 4 0 30319 17626    NET 4 5 RC             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   17626                   return    NET 4 5 RC or later                 4 0 30319 17020 NET 4 5 Preview  September 2011             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   17020                   return    NET 4 5 Preview  September 2011 or later                 4 0 30319 2034    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 009 LDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   2034                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 009 LDR security update  or later                 4 0 30319 1026    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 057 GDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   1026                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 057 GDR security update  or later                 4 0 30319 1022    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 009 GDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   1022                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS14 - 009 GDR security update  or later                 4 0 30319 1008    NET 4 0 on Windows XP SP3  7  7 SP1 with MS13 - 052 GDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   1008                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS13 - 052 GDR security update  or later                 4 0 30319 544    NET 4 0 on Windows XP SP3  7  7 SP1 with MS12 - 035 LDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   544                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS12 - 035 LDR security update  or later                 4 0 30319 447   yes built by  RTMLDR   NET 4 0 Platform Update 1  April 2011             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   447                   return   built by  RTMLDR   NET 4 0 Platform Update 1  April 2011 or later                 4 0 30319 431   yes built by  RTMLDR   NET 4 0 GDR Update  March 2011   with VS 2010 SP1   or NET 4 0 Update             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   431                   return   built by  RTMLDR   NET 4 0 GDR Update  March 2011   with VS 2010 SP1   or NET 4 0 Update or later                 4 0 30319 296    NET 4 0 on Windows XP SP3  7 with MS12 - 074 GDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   296                   return    NET 4 0 on Windows XP SP3  7 with MS12 - 074 GDR security update  or later                 4 0 30319 276    NET 4 0 on Windows XP SP3  4 0 3 Runtime update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   276                   return    NET 4 0 on Windows XP SP3  4 0 3 Runtime update  or later                 4 0 30319 269    NET 4 0 on Windows XP SP3  7  7 SP1 with MS12 - 035 GDR security update              if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   269                   return    NET 4 0 on Windows XP SP3  7  7 SP1 with MS12 - 035 GDR security update  or later                 4 0 30319 1 yes built by  RTMRel   NET 4 0 RTM Release  April 2010             if   Major  gt   4   amp  amp   Minor  gt   0   amp  amp   Build  gt   30319   amp  amp   Revision  gt   1                   return   built by  RTMRel   NET 4 0 RTM Release  April 2010 or later                  4 0 30128 1     built by  RC1Rel   NET 4 0 Release Candidate  Feb 2010             if   Major  gt  4   amp  amp   Minor  gt  0   amp  amp   Build  gt   30128   amp  amp   Revision  gt   1                   return   built by  RC1Rel   NET 4 0 Release Candidate  Feb 2010 or later                 4 0 21006 1     built by  B2Rel   NET 4 0 Beta2  Oct 2009             if   Major  gt  4   amp  amp   Minor  gt  0   amp  amp   Build  gt   21006   amp  amp   Revision  gt  1                   return   built by  B2Rel   NET 4 0 Beta2  Oct 2009 or later                 4 0 20506 1     built by  Beta1   NET 4 0 Beta1  May 2009             if   Major  gt  4   amp  amp   Minor  gt  0   amp  amp   Build  gt   20506   amp  amp   Revision  gt  1                   return   built by  Beta1   NET 4 0 Beta1  May 2009 or later                 4 0 11001 1     built by  CTP2 VPC   NET 4 0 CTP  October 2008             if   Major  gt  4   amp  amp   Minor  gt  0   amp  amp   Build  gt   11001   amp  amp   Revision  gt  1                   return   built by  CTP2 VPC   NET 4 0 CTP  October 2008 or later                  3 5 30729 5420  yes built by  Win7SP1   NET 3 5 1 Sicherheits - Update  12 April 2011             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30729   amp  amp   Revision  gt   5420                   return   built by  Win7SP1   NET 3 5 1 Sicherheits - Update  12 April 2011 or later                 3 5 30729 5004  yes built by  NetFXw7   Windows 7  Rel   Jan 2010    Data functions KB976127  NET 3 5 SP1             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30729   amp  amp   Revision  gt   5004                   return   built by  NetFXw7   Windows 7  Rel   Jan 2010    Data functions KB976127  NET 3 5 SP1 or later                 3 5 30729 4466  yes built by  NetFXw7   Windows XP  Rel    Jan 2010    Data functions KB976127  NET 3 5 SP1             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30729   amp  amp   Revision  gt   4466                   return   built by  NetFXw7   Windows XP  Rel    Jan 2010    Data functions KB976127  NET 3 5 SP1 or later                 3 5 30729 4926  yes built by  NetFXw7   Windows 7 Release  Oct 2009    NET 3 5 SP1   Hotfixes             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30729   amp  amp   Revision  gt   4926                   return   built by  NetFXw7   Windows 7 Release  Oct 2009    NET 3 5 SP1   Hotfixes or later                 3 5 30729 4918      built by  NetFXw7   Windows 7 Release Candidate  June 2009             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30729   amp  amp   Revision  gt   4918                   return   built by  NetFXw7   Windows 7 Release Candidate  June 2009 or later                 3 5 30729 196   yes built by  QFE   NET 3 5 Family Update Vista   W2008  Dec 2008             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   30729   amp  amp   Revision  gt  196                   return   built by  QFE   NET 3 5 Family Update Vista   W2008  Dec 2008 or later                 3 5 30729 1 yes built by  SP   NET 3 5 SP1  Aug 2008             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   30729   amp  amp   Revision  gt  1                   return   built by  SP   NET 3 5 SP1  Aug 2008 or later                  3 5 30428 1         built by  SP1Beta1   NET 3 5 SP1 BETA1  May 2008             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   30428   amp  amp   Revision  gt  1                   return   built by  SP1Beta1   NET 3 5 SP1 BETA1  May 2008 or later                 3 5 21022 8 yes built by  RTM  Jan 2008             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   21022   amp  amp   Revision  gt   8                   return   built by  RTM  Jan 2008 or later                 3 5 20706 1     built by  Beta2  Orcas Beta2  Oct 2007             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   20706   amp  amp   Revision  gt   1                   return   built by  Beta2  Orcas Beta2  Oct 2007 or later                 3 5 20526 0     built by  MCritCTP  Orcas Beta1  Mar 2007             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   20526   amp  amp   Revision  gt  0                   return   built by  MCritCTP  Orcas Beta1  Mar 2007 or later                  3 0 6920 1500   yes built by  QFE  Family Update Vista   W2008  Dez 2008  KB958483             if   Major  gt  3   amp  amp   Minor  gt  0   amp  amp   Build  gt   6920   amp  amp   Revision  gt   1500                   return   built by  QFE  Family Update Vista   W2008  Dez 2008  KB958483 or later                 3 0 4506 4926   yes NetFXw7 030729 - 4900    Windows 7 Release  Oct 2009             if   Major  gt  3   amp  amp   Minor  gt  0   amp  amp   Build  gt   4506   amp  amp   Revision  gt   4926                   return    NetFXw7 030729 - 4900    Windows 7 Release  Oct 2009 or later                 3 0 4506 4918 NetFXw7 030729 - 4900    Windows 7 Release Candidate  June 2009             if   Major  gt  3   amp  amp   Minor  gt  5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   4918                   return    NetFXw7 030729 - 4900    Windows 7 Release Candidate  June 2009 or later                 3 0 4506 2152       3 0 4506 2152 SP 030729 - 0100     NET 4 0 Beta1   May 2009             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   2152                   return   3 0 4506 2152 SP 030729 - 0100     NET 4 0 Beta1   May 2009 or later                 3 0 4506 2123   yes NetFX 030618 - 0000  NET 3 0 SP2  Aug 2008             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   2123                   return   s NetFX 030618 - 0000  NET 3 0 SP2  Aug 2008 or later                 3 0 4506 2062 SP1Beta1 030428 - 0100    NET 3 0 SP1 BETA1  May 2008             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   2062                   return    SP1Beta1 030428 - 0100    NET 3 0 SP1 BETA1  May 2008 or later                 3 0 4506 590 winfxredb2 004506 - 0590   Orcas Beta2  Oct 2007             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   590                   return    winfxredb2 004506 - 0590   Orcas Beta2  Oct 2007 or later                 3 0 4506 577 winfxred 004506 - 0577   Orcas Beta1  Mar 2007             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   577                   return    winfxred 004506 - 0577   Orcas Beta1  Mar 2007 or later                 3 0 4506 30 yes Release   NET Framework 3 0  Nov 2006             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   30                   return   Release   NET Framework 3 0  Nov 2006 or later                 3 0 4506 25 yes WAPRTM 004506 - 0026  Vista Ultimate  Jan 2007             if   Major  gt   3   amp  amp   Minor  gt   5   amp  amp   Build  gt   4506   amp  amp   Revision  gt   25                   return    WAPRTM 004506 - 0026  Vista Ultimate  Jan 2007 or later                  2 0 50727 4927  yes NetFXspW7 050727 - 4900    Windows 7 Release  Oct 2009             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   4927                   return    NetFXspW7 050727 - 4900    Windows 7 Release  Oct 2009 or later                 2 0 50727 4918 NetFXspW7 050727 - 4900    Windows 7 Release Candidate  June 2009             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   4918                   return    NetFXspW7 050727 - 4900    Windows 7 Release Candidate  June 2009 or later                 2 0 50727 4200  yes NetFxQFE 050727 - 4200  NET 2 0 SP2  KB974470  Securityupdate  Oct 2009             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   4200                   return    NetFxQFE 050727 - 4200  NET 2 0 SP2  KB974470  Securityupdate  Oct 2009 or later                 2 0 50727 3603 GDR 050727 - 3600  NET 4 0 Beta 2  Oct 2009             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   3603                   return    GDR 050727 - 3600  NET 4 0 Beta 2  Oct 2009 or later                 2 0 50727 3082  yes QFE 050727 - 3000    NET 3 5 Family Update XP   W2003  Dez 2008  KB958481             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   3082                   return    QFE 050727 - 3000    NET 3 5 Family Update XP   W2003  Dez 2008  KB958481 or later                 2 0 50727 3074  yes QFE 050727 - 3000    NET 3 5 Family Update Vista   W2008  Dez 2008  KB958481             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   3074                   return    QFE 050727 - 3000    NET 3 5 Family Update Vista   W2008  Dez 2008  KB958481 or later                 2 0 50727 3053  yes netfxsp 050727 - 3000    NET 2 0 SP2  Aug 2008             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   3053                   return   yes netfxsp 050727 - 3000    NET 2 0 SP2  Aug 2008 or later                 2 0 50727 3031 netfxsp 050727 - 3000    NET 2 0 SP2 Beta 1  May 2008             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   3031                   return    netfxsp 050727 - 3000    NET 2 0 SP2 Beta 1  May 2008 or later                 2 0 50727 1434  yes REDBITS 050727 - 1400   Windows Server 2008 and Windows Vista SP1  Dez 2007             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   1434                   return    REDBITS 050727 - 1400   Windows Server 2008 and Windows Vista SP1  Dez 2007 or later                 2 0 50727 1433  yes REDBITS 050727 - 1400    NET 2 0 SP1 Release  Nov 2007  http   www microsoft com downloads details aspx FamilyID 79bc3b77-e02c-4ad3-aacf-a7633f706ba5             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   1433                   return    REDBITS 050727 - 1400    NET 2 0 SP1 Release  Nov 2007 or later                 2 0 50727 1378 REDBITSB2 050727 - 1300   Orcas Beta2  Oct 2007             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   1378                   return    REDBITSB2 050727 - 1300   Orcas Beta2  Oct 2007 or later                 2 0 50727 1366 REDBITS 050727 - 1300   Orcas Beta1  Mar 2007             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   1366                   return    REDBITS 050727 - 1300   Orcas Beta1  Mar 2007 or later                 2 0 50727 867   yes VS Express Edition 2005 SP1   Apr 2007  http   www microsoft com downloads details aspx FamilyId 7B0B0339-613A-46E6-AB4D-080D4D4A8C4E             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   867                   return    VS Express Edition 2005 SP1   Apr 2007 or later                 2 0 50727 832 Fix x86 VC  2005   Apr 2007  http   support microsoft com kb 934586 en-us             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   832                   return    Fix x86 VC  2005   Apr 2007 or later                 2 0 50727 762   yes VS TeamSuite SP1   http   www microsoft com downloads details aspx FamilyId BB4A75AB-E2D4-4C96-B39D-37BAF6B5B1DC             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   762                   return    VS TeamSuite SP1  or later                 2 0 50727 312   yes rtmLHS 050727 - 3100  Vista Ultimate  Jan 2007             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   312                   return    rtmLHS 050727 - 3100  Vista Ultimate  Jan 2007 or later                 2 0 50727 42    yes Release   NET Framework 2 0  Oct 2005             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   42                   return   Release   NET Framework 2 0  Oct 2005 or later                 2 0 50727 26        Version 2 0 Visual Studio Team System 2005 Release Candidate  Oct 2005             if   Major  gt   2   amp  amp   Minor  gt   0   amp  amp   Build  gt   50727   amp  amp   Revision  gt   26                   return   Version 2 0 Visual Studio Team System 2005 Release Candidate  Oct 2005 or later                  2 0 50712       Version 2 0 Visual Studio Team System 2005 Drop3  CTP  July 2005             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50712                   return   Version 2 0 Visual Studio Team System 2005 Drop3  CTP  July 2005 or later                 2 0 50215       Version 2 0 WinFX SDK for Indigo   Avalon 2005 CTP  July 2005             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50215                   return   Version 2 0 WinFX SDK for Indigo   Avalon 2005 CTP  July 2005 or later                 2 0 50601 0     Version 2 0 Visual Studio NET 2005 CTP  June 2005             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50601   amp  amp   Revision  gt  0                   return   Version 2 0 Visual Studio NET 2005 CTP  June 2005 or later                 2 0 50215 44        Version 2 0 Visual Studio NET 2005 Beta 2  Visual Studio Express Beta 2  Apr 2005             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50215   amp  amp   Revision  gt   44                   return   Version 2 0 Visual Studio NET 2005 Beta 2  Visual Studio Express Beta 2  Apr 2005 or later                 2 0 50110 28        Version 2 0 Visual Studio NET 2005 CTP  Professional Edition  Feb 2005             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   50110   amp  amp   Revision  gt  28                   return   Version 2 0 Visual Studio NET 2005 CTP  Professional Edition  Feb 2005 or later                 2 0 41115 19        Version 2 0 Visual Studio NET 2005 Beta 1  Team System Refresh  Dec 2004             if   Major  gt  2    amp  amp   Minor  gt  0    amp  amp   Build  gt   41115   amp  amp   Revision  gt   19                   return   Version 2 0 Visual Studio NET 2005 Beta 1  Team System Refresh  Dec 2004 or later                 2 0 40903 0         Version 2 0 Whidbey CTP  Visual Studio Express  Oct 2004             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   40903   amp  amp   Revision  gt  0                   return   Version 2 0 Whidbey CTP  Visual Studio Express  Oct 2004 or later                 2 0 40607 85        Version 2 0 Visual Studio NET 2005 Beta 1  Team System Refresh  Aug 2004               if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   40607   amp  amp   Revision  gt   85                   return   Version 2 0 Visual Studio NET 2005 Beta 1  Team System Refresh  Aug 2004   or later                 2 0 40607 42        Version 2 0 SQL Server Yukon Beta 2  July 2004             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   40607   amp  amp   Revision  gt   42                   return   Version 2 0 SQL Server Yukon Beta 2  July 2004 or later                 2 0 40607 16        Version 2 0 Visual Studio NET 2005 Beta 1  TechEd Europe 2004  June 2004             if   Major  gt  2   amp  amp   Minor  gt  0   amp  amp   Build  gt   40607   amp  amp   Revision  gt   16                   return   Version 2 0 Visual Studio NET 2005 Beta 1  TechEd Europe 2004  June 2004 or later                 2 0 40301 9         Version 2 0 Whidbey CTP  WinHEC 2004  March 2004               if   Major  gt  0   amp  amp   Minor  gt  0   amp  amp   Build  gt   40301   amp  amp   Revision  gt  9                   return   Version 2 0 Whidbey CTP  WinHEC 2004  March 2004   or later                  1 2 30703 27        Version 1 2 Whidbey Alpha  PDC 2004  Nov 2003               if   Major  gt  1   amp  amp   Minor  gt  2   amp  amp   Build  gt   30703   amp  amp   Revision  gt   27                   return   Version 1 2 Whidbey Alpha  PDC 2004  Nov 2003   or later                 1 2 21213 1     Version 1 2 Whidbey pre - Alpha build                if   Major  gt  1   amp  amp   Minor  gt  2   amp  amp   Build  gt   21213   amp  amp   Revision  gt  1                   return   Version 1 2 Whidbey pre - Alpha build    or later                  1 1 4322 2443   yes Version 1 1 Servicepack 1  KB953297  Oct 2009             if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt  2443                   return   Version 1 1 Servicepack 1  KB953297  Oct 2009 or later                 1 1 4322 2407   yes Version 1 1 RTM             if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   2407                   return   Version 1 1 RTM or later                 1 1 4322 2407       Version 1 1 Orcas Beta2  Oct 2007             if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   2407                   return   Version 1 1 Orcas Beta2  Oct 2007 or later                 1 1 4322 2379       Version 1 1 Orcas Beta1  Mar 2007             if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   2379                   return   Version 1 1 Orcas Beta1  Mar 2007 or later                 1 1 4322 2032   yes Version 1 1 SP1 Aug 2004             if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   2032                   return   Version 1 1 SP1 Aug 2004 or later                 1 1 4322 573    yes Version 1 1 RTM Visual Studio NET 2003   Windows Server 2003  Feb 2003               if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   573                   return   Version 1 1 RTM Visual Studio NET 2003   Windows Server 2003  Feb 2003   or later                 1 1 4322 510        Version 1 1 Final Beta Oct 2002               if   Major  gt  1   amp  amp   Minor  gt  1   amp  amp   Build  gt   4322   amp  amp   Revision  gt   510                   return   Version 1 1 Final Beta Oct 2002   or later                  1 0 3705 6018   yes Version 1 0 SP3 Aug 2004             if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   3705   amp  amp   Revision  gt   6018                   return   Version 1 0 SP3 Aug 2004 or later                 1 0 3705 288    yes Version 1 0 SP2 Aug 2002               if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   3705   amp  amp   Revision  gt   288                   return   Version 1 0 SP2 Aug 2002   or later                 1 0 3705 209    yes Version 1 0 SP1 Mar 2002               if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   3705   amp  amp   Revision  gt  209                   return   Version 1 0 SP1 Mar 2002   or later                 1 0 3705 0  yes Version 1 0 RTM Visual Studio NET 2002  Feb 2002               if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   3705   amp  amp   Revision  gt  0                   return   Version 1 0 RTM Visual Studio NET 2002  Feb 2002   or later                 1 0 3512 0      Version 1 0 Pre - release RC3 Visual Studio NET 2002 RC3              if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   3512   amp  amp   Revision  gt  0                   return   Version 1 0 Pre - release RC3 Visual Studio NET 2002 RC3  or later                 1 0 2914 16     Version 1 0 Public Beta 2 Jun 2001               if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   2914   amp  amp   Revision  gt   16                   return   Version 1 0 Public Beta 2 Jun 2001   or later                 1 0 2204 21         Version 1 0 Public Beta 1 Nov 2000               if   Major  gt  1   amp  amp   Minor  gt  0   amp  amp   Build  gt   2204   amp  amp   Revision  gt  21                   return   Version 1 0 Public Beta 1 Nov 2000   or later                return   Unknown  NET version

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Not sure why nobody suggested following the official advice from Microsoft right here   This is the code they recommend  Sure it s ugly  but it works   For  NET 1-4  private static void GetVersionFromRegistry             Opens the registry key for the  NET Framework entry           using  RegistryKey ndpKey                RegistryKey OpenRemoteBaseKey RegistryHive LocalMachine                   OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                              As an alternative  if you know the computers you will query are running  NET Framework 4 5                  or later  you can use                  using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine                   RegistryView Registry32  OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP             foreach  string versionKeyName in ndpKey GetSubKeyNames                          if  versionKeyName StartsWith  v                                   RegistryKey versionKey   ndpKey OpenSubKey versionKeyName                   string name    string versionKey GetValue  Version                        string sp   versionKey GetValue  SP       ToString                    string install   versionKey GetValue  Install       ToString                    if  install          no install info  must be later                      Console WriteLine versionKeyName          name                   else                                       if  sp        amp  amp  install     1                                                 Console WriteLine versionKeyName          name      SP    sp                                                            if  name                                              continue                                    foreach  string subKeyName in versionKey GetSubKeyNames                                          RegistryKey subKey   versionKey OpenSubKey subKeyName                       name    string subKey GetValue  Version                            if  name                                sp   subKey GetValue  SP       ToString                        install   subKey GetValue  Install       ToString                        if  install          no install info  must be later                          Console WriteLine versionKeyName          name                       else                                               if  sp        amp  amp  install     1                                                         Console WriteLine        subKeyName          name      SP    sp                                                     else if  install     1                                                         Console WriteLine        subKeyName          name                                                                                                           For  NET 4 5 and later     Checking the version using  gt   will enable forward compatibility      however you should always compile your code on newer versions of    the framework to ensure your app works the same  private static string CheckFor45DotVersion int releaseKey       if  releaseKey  gt   393295          return  4 6 or later           if   releaseKey  gt   379893             return  4 5 2 or later             if   releaseKey  gt   378675             return  4 5 1 or later             if   releaseKey  gt   378389             return  4 5 or later                This line should never execute  A non-null release key should mean        that 4 5 or later is installed      return  No 4 5 or later version detected      private static void Get45or451FromRegistry         using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                if  ndpKey    null  amp  amp  ndpKey GetValue  Release      null                Console WriteLine  Version      CheckFor45DotVersion  int  ndpKey GetValue  Release                      else            Console WriteLine  Version 4 5 or later is not detected

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I have changed Matt s class so it can be reused in any project without printing all its checks on Console and returning a simple string with correct max version installed   using System  using System Collections Generic  using System Linq  using System Text  using Microsoft Win32   namespace MyNamespace       public class DotNetVersion               protected bool printVerification           public DotNetVersion                this printVerification false                    public DotNetVersion bool printVerification               this printVerification printVerification                      public string getDotNetVersion                string maxDotNetVersion   getVersionFromRegistry                if String Compare maxDotNetVersion   4 5    gt   0                   string v45Plus   get45PlusFromRegistry                    if  string IsNullOrWhiteSpace v45Plus   maxDotNetVersion   v45Plus                            log      Maximum  NET version number found is      maxDotNetVersion                        return maxDotNetVersion                     protected string get45PlusFromRegistry                String dotNetVersion                   const string subkey     SOFTWARE Microsoft NET Framework Setup NDP v4 Full                using RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey subkey                    if ndpKey    null  amp  amp  ndpKey GetValue  Release      null                       dotNetVersion   checkFor45PlusVersion  int ndpKey GetValue  Release                         log   NET Framework Version      dotNetVersion                    else                      log   NET Framework Version 4 5 or later is not detected                                                 return dotNetVersion                        Checking the version using  gt   will enable forward compatibility          protected string checkFor45PlusVersion int releaseKey               if releaseKey  gt   461308  return  4 7 1 or later               if releaseKey  gt   460798  return  4 7               if releaseKey  gt   394802  return  4 6 2               if releaseKey  gt   394254  return  4 6 1               if releaseKey  gt   393295  return  4 6               if  releaseKey  gt   379893   return  4 5 2               if  releaseKey  gt   378675   return  4 5 1               if  releaseKey  gt   378389   return  4 5                   This code should never execute  A non-null release key should mean                that 4 5 or later is installed              log  No 4 5 or later version detected                return                        protected string getVersionFromRegistry                String maxDotNetVersion                      Opens the registry key for the  NET Framework entry              using RegistryKey ndpKey   RegistryKey OpenRemoteBaseKey RegistryHive LocalMachine                                                   OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                         As an alternative  if you know the computers you will query are running  NET Framework 4 5                     or later  you can use                     using RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine                      RegistryView Registry32  OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                     string   subKeyNnames   ndpKey GetSubKeyNames                    foreach string versionKeyName in subKeyNnames                       if versionKeyName StartsWith  v                             RegistryKey versionKey   ndpKey OpenSubKey versionKeyName                           string name   string versionKey GetValue  Version                                string sp   versionKey GetValue  SP       ToString                            string install   versionKey GetValue  Install       ToString                            if string IsNullOrWhiteSpace install      no install info  must be later                              log versionKeyName          name                               if String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                           else                              if  string IsNullOrWhiteSpace sp   amp  amp   1  Equals install                                    log versionKeyName          name      SP    sp                                   if String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                                                                   if  string IsNullOrWhiteSpace name                                continue                                                     string   subKeyNames   versionKey GetSubKeyNames                            foreach string subKeyName in subKeyNames                               RegistryKey subKey   versionKey OpenSubKey subKeyName                               name   string subKey GetValue  Version                                    if  string IsNullOrWhiteSpace name                                    sp   subKey GetValue  SP       ToString                                                              install   subKey GetValue  Install       ToString                                if string IsNullOrWhiteSpace install                                      no install info  must be later                                  log versionKeyName          name                                   if String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                               else                                  if  string IsNullOrWhiteSpace sp   amp  amp   1  Equals install                                        log        subKeyName          name      SP    sp                                       if String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                                                    else if  1  Equals install                                        log        subKeyName          name                                       if String Compare maxDotNetVersion  name   lt  0  maxDotNetVersion   name                                       if                                  if                              for                          if                      foreach                  using             return maxDotNetVersion                     protected void log string message               if printVerification  Console WriteLine message                       class

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This class allows your application to throw out a graceful notification message rather than crash and burn if it couldn t find the proper  NET version  All you need to do is this in your main code    STAThread  static void Main string   args        if   DotNetUtils IsCompatible            return               By default it takes 4 5 2  but you can tweak it to your liking  the class  feel free to replace MessageBox with Console    Updated for 4 8   public class DotNetUtils       public enum DotNetRelease               NOTFOUND          NET45          NET451          NET452          NET46          NET461          NET462          NET47          NET471          NET472          NET48             public static bool IsCompatible DotNetRelease req   DotNetRelease NET452                DotNetRelease r   GetRelease            if  r  lt  req                        MessageBox Show String Format  This this application requires  0  or greater    req ToString                  return false                    return true             public static DotNetRelease GetRelease int release   default int                 int r   release    default int    release   GetVersion            if  r  gt   528040  return DotNetRelease NET48          if  r  gt   461808  return DotNetRelease NET472          if  r  gt   461308  return DotNetRelease NET471          if  r  gt   460798  return DotNetRelease NET47          if  r  gt   394802  return DotNetRelease NET462          if  r  gt   394254  return DotNetRelease NET461          if  r  gt   393295  return DotNetRelease NET46          if  r  gt   379893  return DotNetRelease NET452          if  r  gt   378675  return DotNetRelease NET451          if  r  gt   378389  return DotNetRelease NET45          return DotNetRelease NOTFOUND             public static int GetVersion                 int release   0          using  RegistryKey key   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32                                               OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                            release   Convert ToInt32 key GetValue  Release                       return release            Easily extendable when they add a new version later on  I didn t bother with anything before 4 5 but you get the idea

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public class DA     public static class VersionNetFramework       public static string Get45or451FromRegistry          https   msdn microsoft com en-us library hh925568 v vs 110  aspx         using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey  SOFTWARE  Microsoft  NET Framework Setup  NDP  v4  Full                            int releaseKey   Convert ToInt32 ndpKey GetValue  Release                 if  true                                return    Version      CheckFor45DotVersion releaseKey                                         Checking the version using  gt   will enable forward compatibility          however you should always compile your code on newer versions of        the framework to ensure your app works the same      private static string CheckFor45DotVersion int releaseKey         https   msdn microsoft com en-us library hh925568 v vs 110  aspx         if  releaseKey  gt   394271              return  4 6 1 installed on all other Windows OS versions or later           if  releaseKey  gt   394254              return  4 6 1 installed on Windows 10 or later           if  releaseKey  gt   393297              return  4 6 installed on all other Windows OS versions or later           if  releaseKey  gt   393295              return  4 6 installed with Windows 10 or later           if  releaseKey  gt   379893              return  4 5 2 or later           if  releaseKey  gt   378758              return  4 5 1 installed on Windows 8  Windows 7 SP1  or Windows Vista SP2 or later           if  releaseKey  gt   378675              return  4 5 1 installed with Windows 8 1 or later           if  releaseKey  gt   378389              return  4 5 or later            return  No 4 5 or later version detected             public static string GetVersionFromRegistry          https   msdn microsoft com en-us library hh925568 v vs 110  aspx         string res                   Opens the registry key for the  NET Framework entry          using  RegistryKey ndpKey               RegistryKey OpenRemoteBaseKey RegistryHive LocalMachine                   OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                              As an alternative  if you know the computers you will query are running  NET Framework 4 5                 or later  you can use                 using  RegistryKey ndpKey   RegistryKey OpenBaseKey RegistryHive LocalMachine                  RegistryView Registry32  OpenSubKey   SOFTWARE Microsoft NET Framework Setup NDP                 foreach  string versionKeyName in ndpKey GetSubKeyNames                                  if  versionKeyName StartsWith  v                                           RegistryKey versionKey   ndpKey OpenSubKey versionKeyName                       string name    string versionKey GetValue  Version                            string sp   versionKey GetValue  SP       ToString                        string install   versionKey GetValue  Install       ToString                        if  install          no install info  must be later                          res     versionKeyName          name    Environment NewLine                      else                                               if  sp        amp  amp  install     1                                                         res     versionKeyName          name      SP    sp    Environment NewLine                                                                       if  name                                                      continue                                            foreach  string subKeyName in versionKey GetSubKeyNames                                                  RegistryKey subKey   versionKey OpenSubKey subKeyName                           name    string subKey GetValue  Version                                if  name                                    sp   subKey GetValue  SP       ToString                            install   subKey GetValue  Install       ToString                            if  install          no install info  must be later                              res     versionKeyName          name    Environment NewLine                          else                                                       if  sp        amp  amp  install     1                                                                 res            subKeyName          name      SP    sp    Environment NewLine                                                            else if  install     1                                                                 res            subKeyName          name    Environment NewLine                                                                                                                                  return res            public static string GetUpdateHistory          https   msdn microsoft com en-us library hh925567 v vs 110  aspx         string res              using  RegistryKey baseKey   RegistryKey OpenBaseKey RegistryHive LocalMachine  RegistryView Registry32  OpenSubKey   SOFTWARE Microsoft Updates                          foreach  string baseKeyName in baseKey GetSubKeyNames                                  if  baseKeyName Contains   NET Framework      baseKeyName StartsWith  KB      baseKeyName Contains   NETFramework                                           using  RegistryKey updateKey   baseKey OpenSubKey baseKeyName                                                 string name    string updateKey GetValue  PackageName                                res    baseKeyName          name   Environment NewLine                          foreach  string kbKeyName in updateKey GetSubKeyNames                                                          using  RegistryKey kbKey   updateKey OpenSubKey kbKeyName                                                                 name    string kbKey GetValue  PackageName                                        res            kbKeyName          name    Environment NewLine                                   if  kbKey SubKeyCount  gt  0                                                                        foreach  string sbKeyName in kbKey GetSubKeyNames                                                                                  using  RegistryKey sbSubKey   kbKey OpenSubKey sbKeyName                                                                                         name    string sbSubKey GetValue  PackageName                                                    if  name                                                        name    string sbSubKey GetValue  Description                                                    res              sbKeyName          name    Environment NewLine                                                                                                                                                                                                                                                    return res            using class DA VersionNetFramework  private void Form1 Shown object sender  EventArgs e                  Current OS Information            richTextBox1 Text     Current OS Information        richTextBox1 AppendText Environment NewLine                                Machine Name      Environment MachineName       richTextBox1 AppendText Environment NewLine                                Platform      Environment OSVersion Platform ToString         richTextBox1 AppendText Environment NewLine                               Environment OSVersion                  NET Framework Environment Information            richTextBox1 AppendText Environment NewLine   Environment NewLine                                            NET Framework Environment Information         richTextBox1 AppendText Environment NewLine                                Environment Version     Environment Version       richTextBox1 AppendText Environment NewLine                                DA VersionNetFramework GetVersionDicription                    NET Framework Information From Registry            richTextBox1 AppendText Environment NewLine   Environment NewLine                                            NET Framework Information From Registry         richTextBox1 AppendText Environment NewLine                               DA VersionNetFramework GetVersionFromRegistry                    NET Framework 4 5 or later Information From Registry            richTextBox1 AppendText Environment NewLine                                             NET Framework 4 5 or later Information From Registry         richTextBox1 AppendText Environment NewLine                               DA VersionNetFramework Get45or451FromRegistry                   Update History            richTextBox1 AppendText Environment NewLine   Environment NewLine                                Update History        richTextBox1 AppendText Environment NewLine                                DA VersionNetFramework GetUpdateHistory                   Setting Cursor to first character of textbox            if   richTextBox1 Text Equals                    richTextBox1 SelectionStart   1            Result   Current OS Information  Machine Name  D1 Platform  Win32NT Microsoft Windows NT 6 2 9200 0   NET Framework Environment Information  Environment Version 4 0 30319 42000  NET 4 6 on Windows 8 1 64 - bit or later   NET Framework Information From Registry   v2 0 50727  2 0 50727 4927  SP2 v3 0  3 0 30729 4926  SP2  v3 5  3 5 30729 4926  SP1  v4   Client  4 6 00079   Full  4 6 00079 v4 0   Client  4 0 0 0   NET Framework 4 5 or later Information From Registry  Version  4 6 installed with Windows 10 or later  Update History Microsoft  NET Framework 4 Client Profile   KB2468871   KB2468871v2   KB2478063   KB2533523   KB2544514   KB2600211   KB2600217 Microsoft  NET Framework 4 Extended   KB2468871   KB2468871v2   KB2478063   KB2533523   KB2544514   KB2600211   KB2600217 Microsoft  NET Framework 4 Multi-Targeting Pack   KB2504637  Update for   KB2504637

[c#] Is there an easy way to check the .NET Framework version?

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