What are the correct version numbers for C

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What are the correct version numbers for C   What came out when  Why can t I find any answers about C  3 5   This question is primarily to aid those who are searching for an answer using an incorrect version number  e g  C  3 5  The hope is that anyone failing to find an answer with the wrong version number will find this question and then search again with the right version number

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C  Version History   C  is a simple and powerful object-oriented programming language developed by Microsoft   C  has evolved much since its first release in 2002  C  was introduced with  NET Framework 1 0   The following table lists important features introduced in each version of C    And the latest version of C  is available in C  Versions   1

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You can check the latest C  versions here

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The biggest problem when dealing with C  s version numbers is the fact that it is not tied to a version of the  NET Framework  which it appears to be due to the synchronized releases between Visual Studio and the  NET Framework   The version of C  is actually bound to the compiler  not the framework  For instance  in Visual nbsp Studio nbsp 2008 you can write C  3 0 and target  NET Framework 2 0  3 0 and 3 5  The C  3 0 nomenclature describes the version of the code syntax and supported features in the same way that ANSI C89  C90  C99 describe the code syntax features for C   Take a look at Mono  and you will see that Mono 2 0  mostly implemented version 2 0 of the  NET Framework from the ECMA specifications  supports the C  3 0 syntax and features

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The most recent version is 9 0  which was released in 2020 in  NET 5 0 and included in Visual Studio 2019 version 16 8  Mono is a free and open-source project to develop a cross-platform compiler and runtime environment  i e  virtual machine  for the language

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C  language version history  These are the versions of C  known about at the time of this writing   C  1 0 released with  NET 1 0 and VS2002  January 2002  C  1 2  bizarrely enough   released with  NET 1 1 and VS2003  April 2003   First version to call Dispose on IEnumerators which implemented IDisposable  A few other small features  C  2 0 released with  NET 2 0 and VS2005  November 2005   Major new features  generics  anonymous methods  nullable types  iterator blocks C  3 0 released with  NET 3 5 and VS2008  November 2007   Major new features  lambda expressions  extension methods  expression trees  anonymous types  implicit typing  var   query expressions C  4 0 released with  NET 4 and VS2010  April 2010   Major new features  late binding  dynamic   delegate and interface generic variance  more COM support  named arguments  tuple data type and optional parameters C  5 0 released with  NET 4 5 and VS2012  August 2012   Major features  async programming  caller info attributes  Breaking change  loop variable closure  C  6 0 released with  NET 4 6 and VS2015  July 2015   Implemented by Roslyn  Features  initializers for automatically implemented properties  using directives to import static members  exception filters  element initializers  await in catch and finally  extension Add methods in collection initializers  C  7 0 released with  NET 4 7 and VS2017  March 2017   Major new features  tuples  ref locals and ref return  pattern matching  including pattern-based switch statements   inline out parameter declarations  local functions  binary literals  digit separators  and arbitrary async returns  C  7 1 released with VS2017 v15 3  August 2017  New features  async main  tuple member name inference  default expression  pattern matching with generics  C  7 2 released with VS2017 v15 5  November 2017  New features  private protected access modifier  Span lt T gt   aka interior pointer  aka stackonly struct  everything else  C  7 3 released with VS2017 v15 7  May 2018   New features  enum  delegate and unmanaged generic type constraints  ref reassignment  Unsafe improvements  stackalloc initialization  unpinned indexed fixed buffers  custom fixed statements  Improved overloading resolution  Expression variables in initializers and queries     and    defined for tuples  Auto-properties  backing fields can now be targeted by attributes  C  8 0 released with  Net Core 3 0 and VS2019 v16 3  September 2019   Major new features  nullable reference-types  Asynchronous streams  Indices and Ranges  Readonly members  using declarations default interface methods  Static local functions and Enhancement of interpolated verbatim strings  C  9 0 released with  Net 5 0 and VS2019 v16 8  November 2020   Major new features  init-only properties  records  with-expressions  data classes  positional records  top-level programs  improved pattern matching  simple type patterns  relational patterns  logical patterns   improved target typing  target-type new expressions  target typed    and     covariant returns  Minor features  relax ordering of ref and partial modifiers  parameter null checking  lambda discard parameters  native ints  attributes on local functions  function pointers  static lambdas  extension GetEnumerator  module initializers  extending partial   In response to the OP s question   What are the correct version numbers for C   What came out when  Why can t I find any answers about C  3 5   There is no such thing as C  3 5 - the cause of confusion here is that the C  3 0 is present in  NET 3 5  The language and framework are versioned independently  however - as is the CLR  which is at version 2 0 for  NET 2 0 through 3 5   NET 4 introducing CLR 4 0  service packs notwithstanding  The CLR in  NET 4 5 has various improvements  but the versioning is unclear  in some places it may be referred to as CLR 4 5  this MSDN page used to refer to it that way  for example   but the Environment Version property still reports 4 0 xxx  As of May 3  2017  the C  Language Team created a history of C  versions and features on their GitHub repository  Features Added in C  Language Versions  There is also a page that tracks upcoming and recently implemented language features

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The biggest problem when dealing with C  s version numbers is the fact that it is not tied to a version of the  NET Framework  which it appears to be due to the synchronized releases between Visual Studio and the  NET Framework   The version of C  is actually bound to the compiler  not the framework  For instance  in Visual nbsp Studio nbsp 2008 you can write C  3 0 and target  NET Framework 2 0  3 0 and 3 5  The C  3 0 nomenclature describes the version of the code syntax and supported features in the same way that ANSI C89  C90  C99 describe the code syntax features for C   Take a look at Mono  and you will see that Mono 2 0  mostly implemented version 2 0 of the  NET Framework from the ECMA specifications  supports the C  3 0 syntax and features

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C  8 0 is the latest version of c  it is supported only on  NET Core 3 x and newer versions  Many of the newest features require library and runtime features introduced in  NET Core 3 x  The following table lists the target framework with version and their default C  version     Source - C  language versioning

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C  language version history  These are the versions of C  known about at the time of this writing   C  1 0 released with  NET 1 0 and VS2002  January 2002  C  1 2  bizarrely enough   released with  NET 1 1 and VS2003  April 2003   First version to call Dispose on IEnumerators which implemented IDisposable  A few other small features  C  2 0 released with  NET 2 0 and VS2005  November 2005   Major new features  generics  anonymous methods  nullable types  iterator blocks C  3 0 released with  NET 3 5 and VS2008  November 2007   Major new features  lambda expressions  extension methods  expression trees  anonymous types  implicit typing  var   query expressions C  4 0 released with  NET 4 and VS2010  April 2010   Major new features  late binding  dynamic   delegate and interface generic variance  more COM support  named arguments  tuple data type and optional parameters C  5 0 released with  NET 4 5 and VS2012  August 2012   Major features  async programming  caller info attributes  Breaking change  loop variable closure  C  6 0 released with  NET 4 6 and VS2015  July 2015   Implemented by Roslyn  Features  initializers for automatically implemented properties  using directives to import static members  exception filters  element initializers  await in catch and finally  extension Add methods in collection initializers  C  7 0 released with  NET 4 7 and VS2017  March 2017   Major new features  tuples  ref locals and ref return  pattern matching  including pattern-based switch statements   inline out parameter declarations  local functions  binary literals  digit separators  and arbitrary async returns  C  7 1 released with VS2017 v15 3  August 2017  New features  async main  tuple member name inference  default expression  pattern matching with generics  C  7 2 released with VS2017 v15 5  November 2017  New features  private protected access modifier  Span lt T gt   aka interior pointer  aka stackonly struct  everything else  C  7 3 released with VS2017 v15 7  May 2018   New features  enum  delegate and unmanaged generic type constraints  ref reassignment  Unsafe improvements  stackalloc initialization  unpinned indexed fixed buffers  custom fixed statements  Improved overloading resolution  Expression variables in initializers and queries     and    defined for tuples  Auto-properties  backing fields can now be targeted by attributes  C  8 0 released with  Net Core 3 0 and VS2019 v16 3  September 2019   Major new features  nullable reference-types  Asynchronous streams  Indices and Ranges  Readonly members  using declarations default interface methods  Static local functions and Enhancement of interpolated verbatim strings  C  9 0 released with  Net 5 0 and VS2019 v16 8  November 2020   Major new features  init-only properties  records  with-expressions  data classes  positional records  top-level programs  improved pattern matching  simple type patterns  relational patterns  logical patterns   improved target typing  target-type new expressions  target typed    and     covariant returns  Minor features  relax ordering of ref and partial modifiers  parameter null checking  lambda discard parameters  native ints  attributes on local functions  function pointers  static lambdas  extension GetEnumerator  module initializers  extending partial   In response to the OP s question   What are the correct version numbers for C   What came out when  Why can t I find any answers about C  3 5   There is no such thing as C  3 5 - the cause of confusion here is that the C  3 0 is present in  NET 3 5  The language and framework are versioned independently  however - as is the CLR  which is at version 2 0 for  NET 2 0 through 3 5   NET 4 introducing CLR 4 0  service packs notwithstanding  The CLR in  NET 4 5 has various improvements  but the versioning is unclear  in some places it may be referred to as CLR 4 5  this MSDN page used to refer to it that way  for example   but the Environment Version property still reports 4 0 xxx  As of May 3  2017  the C  Language Team created a history of C  versions and features on their GitHub repository  Features Added in C  Language Versions  There is also a page that tracks upcoming and recently implemented language features

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C  1 0 with Visual Studio NET C  2 0 with Visual Studio 2005 C  3 0 with Visual Studio 2008 C  4 0 with Visual Studio 2010 C  5 0 with Visual Studio 2012 C  6 0 with Visual Studio 2015 C  7 0 with Visual Studio 2017 C  8 0 with Visual Studio 2019

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This is the same as most answers here  but tabularized for ease  and it has Visual Studio and  NET versions for completeness      C  version VS version  NET version CLR version Release date     1 0 2002 1 0 1 0 Feb 2002   1 2 2003 1 1 1 1 Apr 2003   2 0 2005 2 0 2 0 Nov 2005     3 0 2 0 Nov 2006   3 0 2008 3 5 2 0 Nov 2007   4 0 2010 4 0 4 Apr 2010   5 0 2012 4 5 4 Aug 2012   5 0 2013 4 5 1 4 Oct 2013     4 5 2 4 May 2014   6 0 2015 4 6 4 Jul 2015     4 6 1 4 Nov 2015     4 6 2 4 Aug 2016   7 0 2017   Mar 2017     4 7 4 May 2017   7 1 2017 v15 3    Aug 2017     4 7 1 4 Oct 2017   7 2 2017 v15 5    Dec 2017     4 7 2 4 Apr 2018   7 3 2017 v15 7    May 2018   8 0 2019 4 8 4 Apr 2019   9 0 2019 v16 8  5 0     Nov 2020       -  NET 5 0 is not a newer version of  NET framework but  NET Core 3  Starting from  NET 5 0  there are no newer versions of  NET full framework     - There are no separate CLR  CoreCLR  versions for  NET Core  Whatever is the  NET Core version is the CoreCLR version  So not mentioning it   Note   NET development is pretty much independent of VS these days  there is no correlation between versions of each  Refer to  quot  NET Framework versions and dependencies quot  for more

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VERSION     LANGUAGE SPECIFICATION      MICROSOFT COMPILER  C  1 0 1 2    December 2001  2003            January 2002   C  2 0       September 2005                November 2005   C  3 0       May 2006                     November 2006   C  4 0       March 2009  draft               April 2010   C  5 0  released with  NET 4 5 in August 2012  C  6 0  released with  NET  4 6   2015  C  7 0  released with  NET  4 7   2017  C  8 0  released with  NET  4 8   2019

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C  1 0 with Visual Studio NET C  2 0 with Visual Studio 2005 C  3 0 with Visual Studio 2008 C  4 0 with Visual Studio 2010 C  5 0 with Visual Studio 2012 C  6 0 with Visual Studio 2015 C  7 0 with Visual Studio 2017 C  8 0 with Visual Studio 2019

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This is the same as most answers here  but tabularized for ease  and it has Visual Studio and  NET versions for completeness      C  version VS version  NET version CLR version Release date     1 0 2002 1 0 1 0 Feb 2002   1 2 2003 1 1 1 1 Apr 2003   2 0 2005 2 0 2 0 Nov 2005     3 0 2 0 Nov 2006   3 0 2008 3 5 2 0 Nov 2007   4 0 2010 4 0 4 Apr 2010   5 0 2012 4 5 4 Aug 2012   5 0 2013 4 5 1 4 Oct 2013     4 5 2 4 May 2014   6 0 2015 4 6 4 Jul 2015     4 6 1 4 Nov 2015     4 6 2 4 Aug 2016   7 0 2017   Mar 2017     4 7 4 May 2017   7 1 2017 v15 3    Aug 2017     4 7 1 4 Oct 2017   7 2 2017 v15 5    Dec 2017     4 7 2 4 Apr 2018   7 3 2017 v15 7    May 2018   8 0 2019 4 8 4 Apr 2019   9 0 2019 v16 8  5 0     Nov 2020       -  NET 5 0 is not a newer version of  NET framework but  NET Core 3  Starting from  NET 5 0  there are no newer versions of  NET full framework     - There are no separate CLR  CoreCLR  versions for  NET Core  Whatever is the  NET Core version is the CoreCLR version  So not mentioning it   Note   NET development is pretty much independent of VS these days  there is no correlation between versions of each  Refer to  quot  NET Framework versions and dependencies quot  for more

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C  language version history  These are the versions of C  known about at the time of this writing   C  1 0 released with  NET 1 0 and VS2002  January 2002  C  1 2  bizarrely enough   released with  NET 1 1 and VS2003  April 2003   First version to call Dispose on IEnumerators which implemented IDisposable  A few other small features  C  2 0 released with  NET 2 0 and VS2005  November 2005   Major new features  generics  anonymous methods  nullable types  iterator blocks C  3 0 released with  NET 3 5 and VS2008  November 2007   Major new features  lambda expressions  extension methods  expression trees  anonymous types  implicit typing  var   query expressions C  4 0 released with  NET 4 and VS2010  April 2010   Major new features  late binding  dynamic   delegate and interface generic variance  more COM support  named arguments  tuple data type and optional parameters C  5 0 released with  NET 4 5 and VS2012  August 2012   Major features  async programming  caller info attributes  Breaking change  loop variable closure  C  6 0 released with  NET 4 6 and VS2015  July 2015   Implemented by Roslyn  Features  initializers for automatically implemented properties  using directives to import static members  exception filters  element initializers  await in catch and finally  extension Add methods in collection initializers  C  7 0 released with  NET 4 7 and VS2017  March 2017   Major new features  tuples  ref locals and ref return  pattern matching  including pattern-based switch statements   inline out parameter declarations  local functions  binary literals  digit separators  and arbitrary async returns  C  7 1 released with VS2017 v15 3  August 2017  New features  async main  tuple member name inference  default expression  pattern matching with generics  C  7 2 released with VS2017 v15 5  November 2017  New features  private protected access modifier  Span lt T gt   aka interior pointer  aka stackonly struct  everything else  C  7 3 released with VS2017 v15 7  May 2018   New features  enum  delegate and unmanaged generic type constraints  ref reassignment  Unsafe improvements  stackalloc initialization  unpinned indexed fixed buffers  custom fixed statements  Improved overloading resolution  Expression variables in initializers and queries     and    defined for tuples  Auto-properties  backing fields can now be targeted by attributes  C  8 0 released with  Net Core 3 0 and VS2019 v16 3  September 2019   Major new features  nullable reference-types  Asynchronous streams  Indices and Ranges  Readonly members  using declarations default interface methods  Static local functions and Enhancement of interpolated verbatim strings  C  9 0 released with  Net 5 0 and VS2019 v16 8  November 2020   Major new features  init-only properties  records  with-expressions  data classes  positional records  top-level programs  improved pattern matching  simple type patterns  relational patterns  logical patterns   improved target typing  target-type new expressions  target typed    and     covariant returns  Minor features  relax ordering of ref and partial modifiers  parameter null checking  lambda discard parameters  native ints  attributes on local functions  function pointers  static lambdas  extension GetEnumerator  module initializers  extending partial   In response to the OP s question   What are the correct version numbers for C   What came out when  Why can t I find any answers about C  3 5   There is no such thing as C  3 5 - the cause of confusion here is that the C  3 0 is present in  NET 3 5  The language and framework are versioned independently  however - as is the CLR  which is at version 2 0 for  NET 2 0 through 3 5   NET 4 introducing CLR 4 0  service packs notwithstanding  The CLR in  NET 4 5 has various improvements  but the versioning is unclear  in some places it may be referred to as CLR 4 5  this MSDN page used to refer to it that way  for example   but the Environment Version property still reports 4 0 xxx  As of May 3  2017  the C  Language Team created a history of C  versions and features on their GitHub repository  Features Added in C  Language Versions  There is also a page that tracks upcoming and recently implemented language features

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Version      NET Framework  Visual Studio   Important Features C  1 0   NET Framework 1 0 1 1  Visual Studio  NET 2002           Basic features  C  2 0   NET Framework 2 0  Visual Studio 2005        Generics     Partial types     Anonymous methods     Iterators     Nullable types     Private setters  properties      Method group conversions  delegates      Covariance and Contra-variance     Static classes  C  3 0   NET Framework 3 0 3 5  Visual Studio 2008        Implicitly typed local variables     Object and collection initializers     Auto-Implemented properties     Anonymous types     Extension methods     Query expressions     Lambda expressions     Expression trees     Partial Methods  C  4 0   NET Framework 4 0  Visual Studio 2010        Dynamic binding  late binding      Named and optional arguments     Generic co- and contravariance     Embedded interop types  C  5 0   NET Framework 4 5  Visual Studio 2012 2013           Async features     Caller information  C  6 0   NET Framework 4 6  Visual Studio 2013 2015           Expression Bodied Methods     Auto-property initializer     nameof Expression     Primary constructor     Await in catch block     Exception Filter     String Interpolation  C  7 0   NET Core 2 0   Visual Studio 2017        out variables     Tuples     Discards     Pattern Matching     Local functions     Generalized async return types     Numeric literal syntax improvements C  8 0   NET Core 3 0   Visual Studio 2019             Readonly members     Default interface methods     Pattern matching enhancements          Switch expressions         Property patterns         Tuple patterns         Positional patterns     Using declarations     Static local functions     Disposable ref structs     Nullable reference types     Asynchronous streams     Asynchronous disposable     Indices and ranges     Null-coalescing assignment     Unmanaged constructed types     Stackalloc in nested expressions     Enhancement of interpolated verbatim strings

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Comparing the MSDN articles  What s New in the C  2 0 Language and Compiler  and  What s New in Visual C  2005   it is possible to deduce that  C  major version minor version  is coined according to the compiler s version numbering   There is C  1 2 corresponding to  NET  1 1 and VS 2003 and also named as Visual C   NET 2003   But further on Microsoft stopped to increment the minor version  after the dot  numbers or to have them other than zero  0  Though it should be noted that C  corresponding to  NET 3 5 is named in msdn microsoft com as  Visual C  2008 Service Pack 1    There are two parallel namings  By major  NET compiler version numbering and by Visual Studio numbering   C  2 0 is a synonym for Visual C  2005  C  3 0  corresponds  or  more correctly  can target  to     NET 2 0  lt     Visual C  2005  NET3 0  lt     Visual C  2008  NET 3 5  lt     Visual C  2008 Service Pack 1

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C  8 0 is the latest version of c  it is supported only on  NET Core 3 x and newer versions  Many of the newest features require library and runtime features introduced in  NET Core 3 x  The following table lists the target framework with version and their default C  version     Source - C  language versioning

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I ve summarised most of the versions in this table  The only ones missing should be ASP NET Core versions  I ve also added different versions of ASP NET MVC   Note that ASP NET 5 has been rebranded as ASP NET Core 1 0 and ASP NET MVC 6 has been rebranded as ASP NET Core MVC 1 0 0  I believe this change occurred sometime around Jan 2016   I have included the release date of ASP NET 5 RC1 in the table  but I ve yet to include ASP NET core 1 0 and other core versions  because I couldn t find the exact release dates  You can read more about the release dates regarding ASP NET Core here  When is ASP NET Core 1 0  ASP NET 5   vNext  scheduled for release

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C  Version History   C  is a simple and powerful object-oriented programming language developed by Microsoft   C  has evolved much since its first release in 2002  C  was introduced with  NET Framework 1 0   The following table lists important features introduced in each version of C    And the latest version of C  is available in C  Versions   1

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Version      NET Framework  Visual Studio   Important Features C  1 0   NET Framework 1 0 1 1  Visual Studio  NET 2002           Basic features  C  2 0   NET Framework 2 0  Visual Studio 2005        Generics     Partial types     Anonymous methods     Iterators     Nullable types     Private setters  properties      Method group conversions  delegates      Covariance and Contra-variance     Static classes  C  3 0   NET Framework 3 0 3 5  Visual Studio 2008        Implicitly typed local variables     Object and collection initializers     Auto-Implemented properties     Anonymous types     Extension methods     Query expressions     Lambda expressions     Expression trees     Partial Methods  C  4 0   NET Framework 4 0  Visual Studio 2010        Dynamic binding  late binding      Named and optional arguments     Generic co- and contravariance     Embedded interop types  C  5 0   NET Framework 4 5  Visual Studio 2012 2013           Async features     Caller information  C  6 0   NET Framework 4 6  Visual Studio 2013 2015           Expression Bodied Methods     Auto-property initializer     nameof Expression     Primary constructor     Await in catch block     Exception Filter     String Interpolation  C  7 0   NET Core 2 0   Visual Studio 2017        out variables     Tuples     Discards     Pattern Matching     Local functions     Generalized async return types     Numeric literal syntax improvements C  8 0   NET Core 3 0   Visual Studio 2019             Readonly members     Default interface methods     Pattern matching enhancements          Switch expressions         Property patterns         Tuple patterns         Positional patterns     Using declarations     Static local functions     Disposable ref structs     Nullable reference types     Asynchronous streams     Asynchronous disposable     Indices and ranges     Null-coalescing assignment     Unmanaged constructed types     Stackalloc in nested expressions     Enhancement of interpolated verbatim strings

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I ve summarised most of the versions in this table  The only ones missing should be ASP NET Core versions  I ve also added different versions of ASP NET MVC   Note that ASP NET 5 has been rebranded as ASP NET Core 1 0 and ASP NET MVC 6 has been rebranded as ASP NET Core MVC 1 0 0  I believe this change occurred sometime around Jan 2016   I have included the release date of ASP NET 5 RC1 in the table  but I ve yet to include ASP NET core 1 0 and other core versions  because I couldn t find the exact release dates  You can read more about the release dates regarding ASP NET Core here  When is ASP NET Core 1 0  ASP NET 5   vNext  scheduled for release

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C  1 0 - Visual Studio  NET 2002  Classes Structs Interfaces Events Properties Delegates Expressions Statements Attributes Literals   C  1 2 - Visual Studio  NET 2003  Dispose in foreach foreach over string specialization C  2 - Visual Studio 2005 Generics Partial types Anonymous methods Iterators Nullable types Getter setter separate accessibility Method group conversions  delegates  Static classes Delegate inference   C  3 - Visual Studio 2008  Implicitly typed local variables Object and collection initializers Auto-Implemented properties Anonymous types Extension methods Query expressions Lambda expression Expression trees Partial methods   C  4 - Visual Studio 2010  Dynamic binding Named and optional arguments Co- and Contra-variance for generic delegates and interfaces Embedded interop types   NoPIA     C  5 - Visual Studio 2012      Asynchronous methods     Caller info attributes   C  6 - Visual Studio 2015  Draft Specification online Compiler-as-a-service  Roslyn  Import of static type members into namespace Exception filters Await in catch finally blocks Auto property initializers Default values for getter-only properties Expression-bodied members Null propagator  null-conditional operator  succinct null checking  String interpolation nameof operator Dictionary initializer   C  7 0 - Visual Studio 2017  Out variables Pattern matching Tuples Deconstruction Discards Local Functions Binary Literals Digit Separators Ref returns and locals Generalized async return types More expression-bodied members Throw expressions   C  7 1 - Visual Studio 2017 version 15 3  Async main Default expressions Reference assemblies Inferred tuple element names Pattern-matching with generics   C  7 2 - Visual Studio 2017 version 15 5  Span and ref-like types In parameters and readonly references Ref conditional Non-trailing named arguments Private protected accessibility Digit separator after base specifier   C  7 3 - Visual Studio 2017 version 15 7  System Enum  System Delegate and unmanaged constraints  Ref local re-assignment  Ref locals and ref parameters can now be reassigned with the ref assignment operator    ref   Stackalloc initializers  Stack-allocated arrays can now be initialized  e g  Span lt int gt  x   stackalloc     1  2  3     Indexing movable fixed buffers  Fixed buffers can be indexed into without first being pinned  Custom fixed statement  Types that implement a suitable GetPinnableReference can be used in a fixed statement  Improved overload candidates  Some overload resolution candidates can be ruled out early  thus reducing ambiguities  Expression variables in initializers and queries  Expression variables like out var and pattern variables are allowed in field initializers  constructor initializers and LINQ queries  Tuple comparison  Tuples can now be compared with    and     Attributes on backing fields  Allows  field       attributes on an auto-implemented property to target its backing field    C  8 0 -  NET Core 3 0 and Visual Studio 2019 version 16 3  Nullable reference types  express nullability intent on reference types with    notnull constraint and annotations attributes in APIs  the compiler will use those to try and detect possible null values being dereferenced or passed to unsuitable APIs  Default interface members  interfaces can now have members with default implementations  as well as static private protected internal members except for state  ie  no fields   Recursive patterns  positional and property patterns allow testing deeper into an object  and switch expressions allow for testing multiple patterns and producing corresponding results in a compact fashion  Async streams  await foreach and await using allow for asynchronous enumeration and disposal of IAsyncEnumerable lt T gt  collections and IAsyncDisposable resources  and async-iterator methods allow convenient implementation of such asynchronous streams  Enhanced using  a using declaration is added with an implicit scope and using statements and declarations allow disposal of ref structs using a pattern  Ranges and indexes  the i  j syntax allows constructing System Range instances  the  k syntax allows constructing System Index instances  and those can be used to index slice collections  Null-coalescing assignment      allows conditionally assigning when the value is null  Static local functions  local functions modified with static cannot capture this or local variables  and local function parameters now shadow locals in parent scopes  Unmanaged generic structs  generic struct types that only have unmanaged fields are now considered unmanaged  ie  they satisfy the unmanaged constraint   Readonly members  individual members can now be marked as readonly to indicate and enforce that they do not modify instance state  Stackalloc in nested contexts  stackalloc expressions are now allowed in more expression contexts  Alternative interpolated verbatim strings          strings are recognized as interpolated verbatim strings just like          Obsolete on property accessors  property accessors can now be individually marked as obsolete  Permit t is null on unconstrained type parameter    source    https   github com dotnet csharplang blob master Language-Version-History md

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Comparing the MSDN articles  What s New in the C  2 0 Language and Compiler  and  What s New in Visual C  2005   it is possible to deduce that  C  major version minor version  is coined according to the compiler s version numbering   There is C  1 2 corresponding to  NET  1 1 and VS 2003 and also named as Visual C   NET 2003   But further on Microsoft stopped to increment the minor version  after the dot  numbers or to have them other than zero  0  Though it should be noted that C  corresponding to  NET 3 5 is named in msdn microsoft com as  Visual C  2008 Service Pack 1    There are two parallel namings  By major  NET compiler version numbering and by Visual Studio numbering   C  2 0 is a synonym for Visual C  2005  C  3 0  corresponds  or  more correctly  can target  to     NET 2 0  lt     Visual C  2005  NET3 0  lt     Visual C  2008  NET 3 5  lt     Visual C  2008 Service Pack 1

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The biggest problem when dealing with C  s version numbers is the fact that it is not tied to a version of the  NET Framework  which it appears to be due to the synchronized releases between Visual Studio and the  NET Framework   The version of C  is actually bound to the compiler  not the framework  For instance  in Visual nbsp Studio nbsp 2008 you can write C  3 0 and target  NET Framework 2 0  3 0 and 3 5  The C  3 0 nomenclature describes the version of the code syntax and supported features in the same way that ANSI C89  C90  C99 describe the code syntax features for C   Take a look at Mono  and you will see that Mono 2 0  mostly implemented version 2 0 of the  NET Framework from the ECMA specifications  supports the C  3 0 syntax and features

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VERSION     LANGUAGE SPECIFICATION      MICROSOFT COMPILER  C  1 0 1 2    December 2001  2003            January 2002   C  2 0       September 2005                November 2005   C  3 0       May 2006                     November 2006   C  4 0       March 2009  draft               April 2010   C  5 0  released with  NET 4 5 in August 2012  C  6 0  released with  NET  4 6   2015  C  7 0  released with  NET  4 7   2017  C  8 0  released with  NET  4 8   2019

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C  1 0 - Visual Studio  NET 2002  Classes Structs Interfaces Events Properties Delegates Expressions Statements Attributes Literals   C  1 2 - Visual Studio  NET 2003  Dispose in foreach foreach over string specialization C  2 - Visual Studio 2005 Generics Partial types Anonymous methods Iterators Nullable types Getter setter separate accessibility Method group conversions  delegates  Static classes Delegate inference   C  3 - Visual Studio 2008  Implicitly typed local variables Object and collection initializers Auto-Implemented properties Anonymous types Extension methods Query expressions Lambda expression Expression trees Partial methods   C  4 - Visual Studio 2010  Dynamic binding Named and optional arguments Co- and Contra-variance for generic delegates and interfaces Embedded interop types   NoPIA     C  5 - Visual Studio 2012      Asynchronous methods     Caller info attributes   C  6 - Visual Studio 2015  Draft Specification online Compiler-as-a-service  Roslyn  Import of static type members into namespace Exception filters Await in catch finally blocks Auto property initializers Default values for getter-only properties Expression-bodied members Null propagator  null-conditional operator  succinct null checking  String interpolation nameof operator Dictionary initializer   C  7 0 - Visual Studio 2017  Out variables Pattern matching Tuples Deconstruction Discards Local Functions Binary Literals Digit Separators Ref returns and locals Generalized async return types More expression-bodied members Throw expressions   C  7 1 - Visual Studio 2017 version 15 3  Async main Default expressions Reference assemblies Inferred tuple element names Pattern-matching with generics   C  7 2 - Visual Studio 2017 version 15 5  Span and ref-like types In parameters and readonly references Ref conditional Non-trailing named arguments Private protected accessibility Digit separator after base specifier   C  7 3 - Visual Studio 2017 version 15 7  System Enum  System Delegate and unmanaged constraints  Ref local re-assignment  Ref locals and ref parameters can now be reassigned with the ref assignment operator    ref   Stackalloc initializers  Stack-allocated arrays can now be initialized  e g  Span lt int gt  x   stackalloc     1  2  3     Indexing movable fixed buffers  Fixed buffers can be indexed into without first being pinned  Custom fixed statement  Types that implement a suitable GetPinnableReference can be used in a fixed statement  Improved overload candidates  Some overload resolution candidates can be ruled out early  thus reducing ambiguities  Expression variables in initializers and queries  Expression variables like out var and pattern variables are allowed in field initializers  constructor initializers and LINQ queries  Tuple comparison  Tuples can now be compared with    and     Attributes on backing fields  Allows  field       attributes on an auto-implemented property to target its backing field    C  8 0 -  NET Core 3 0 and Visual Studio 2019 version 16 3  Nullable reference types  express nullability intent on reference types with    notnull constraint and annotations attributes in APIs  the compiler will use those to try and detect possible null values being dereferenced or passed to unsuitable APIs  Default interface members  interfaces can now have members with default implementations  as well as static private protected internal members except for state  ie  no fields   Recursive patterns  positional and property patterns allow testing deeper into an object  and switch expressions allow for testing multiple patterns and producing corresponding results in a compact fashion  Async streams  await foreach and await using allow for asynchronous enumeration and disposal of IAsyncEnumerable lt T gt  collections and IAsyncDisposable resources  and async-iterator methods allow convenient implementation of such asynchronous streams  Enhanced using  a using declaration is added with an implicit scope and using statements and declarations allow disposal of ref structs using a pattern  Ranges and indexes  the i  j syntax allows constructing System Range instances  the  k syntax allows constructing System Index instances  and those can be used to index slice collections  Null-coalescing assignment      allows conditionally assigning when the value is null  Static local functions  local functions modified with static cannot capture this or local variables  and local function parameters now shadow locals in parent scopes  Unmanaged generic structs  generic struct types that only have unmanaged fields are now considered unmanaged  ie  they satisfy the unmanaged constraint   Readonly members  individual members can now be marked as readonly to indicate and enforce that they do not modify instance state  Stackalloc in nested contexts  stackalloc expressions are now allowed in more expression contexts  Alternative interpolated verbatim strings          strings are recognized as interpolated verbatim strings just like          Obsolete on property accessors  property accessors can now be individually marked as obsolete  Permit t is null on unconstrained type parameter    source    https   github com dotnet csharplang blob master Language-Version-History md

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You can check the latest C  versions here

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C  language version history  These are the versions of C  known about at the time of this writing   C  1 0 released with  NET 1 0 and VS2002  January 2002  C  1 2  bizarrely enough   released with  NET 1 1 and VS2003  April 2003   First version to call Dispose on IEnumerators which implemented IDisposable  A few other small features  C  2 0 released with  NET 2 0 and VS2005  November 2005   Major new features  generics  anonymous methods  nullable types  iterator blocks C  3 0 released with  NET 3 5 and VS2008  November 2007   Major new features  lambda expressions  extension methods  expression trees  anonymous types  implicit typing  var   query expressions C  4 0 released with  NET 4 and VS2010  April 2010   Major new features  late binding  dynamic   delegate and interface generic variance  more COM support  named arguments  tuple data type and optional parameters C  5 0 released with  NET 4 5 and VS2012  August 2012   Major features  async programming  caller info attributes  Breaking change  loop variable closure  C  6 0 released with  NET 4 6 and VS2015  July 2015   Implemented by Roslyn  Features  initializers for automatically implemented properties  using directives to import static members  exception filters  element initializers  await in catch and finally  extension Add methods in collection initializers  C  7 0 released with  NET 4 7 and VS2017  March 2017   Major new features  tuples  ref locals and ref return  pattern matching  including pattern-based switch statements   inline out parameter declarations  local functions  binary literals  digit separators  and arbitrary async returns  C  7 1 released with VS2017 v15 3  August 2017  New features  async main  tuple member name inference  default expression  pattern matching with generics  C  7 2 released with VS2017 v15 5  November 2017  New features  private protected access modifier  Span lt T gt   aka interior pointer  aka stackonly struct  everything else  C  7 3 released with VS2017 v15 7  May 2018   New features  enum  delegate and unmanaged generic type constraints  ref reassignment  Unsafe improvements  stackalloc initialization  unpinned indexed fixed buffers  custom fixed statements  Improved overloading resolution  Expression variables in initializers and queries     and    defined for tuples  Auto-properties  backing fields can now be targeted by attributes  C  8 0 released with  Net Core 3 0 and VS2019 v16 3  September 2019   Major new features  nullable reference-types  Asynchronous streams  Indices and Ranges  Readonly members  using declarations default interface methods  Static local functions and Enhancement of interpolated verbatim strings  C  9 0 released with  Net 5 0 and VS2019 v16 8  November 2020   Major new features  init-only properties  records  with-expressions  data classes  positional records  top-level programs  improved pattern matching  simple type patterns  relational patterns  logical patterns   improved target typing  target-type new expressions  target typed    and     covariant returns  Minor features  relax ordering of ref and partial modifiers  parameter null checking  lambda discard parameters  native ints  attributes on local functions  function pointers  static lambdas  extension GetEnumerator  module initializers  extending partial   In response to the OP s question   What are the correct version numbers for C   What came out when  Why can t I find any answers about C  3 5   There is no such thing as C  3 5 - the cause of confusion here is that the C  3 0 is present in  NET 3 5  The language and framework are versioned independently  however - as is the CLR  which is at version 2 0 for  NET 2 0 through 3 5   NET 4 introducing CLR 4 0  service packs notwithstanding  The CLR in  NET 4 5 has various improvements  but the versioning is unclear  in some places it may be referred to as CLR 4 5  this MSDN page used to refer to it that way  for example   but the Environment Version property still reports 4 0 xxx  As of May 3  2017  the C  Language Team created a history of C  versions and features on their GitHub repository  Features Added in C  Language Versions  There is also a page that tracks upcoming and recently implemented language features

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The biggest problem when dealing with C  s version numbers is the fact that it is not tied to a version of the  NET Framework  which it appears to be due to the synchronized releases between Visual Studio and the  NET Framework   The version of C  is actually bound to the compiler  not the framework  For instance  in Visual nbsp Studio nbsp 2008 you can write C  3 0 and target  NET Framework 2 0  3 0 and 3 5  The C  3 0 nomenclature describes the version of the code syntax and supported features in the same way that ANSI C89  C90  C99 describe the code syntax features for C   Take a look at Mono  and you will see that Mono 2 0  mostly implemented version 2 0 of the  NET Framework from the ECMA specifications  supports the C  3 0 syntax and features

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The most recent version is 9 0  which was released in 2020 in  NET 5 0 and included in Visual Studio 2019 version 16 8  Mono is a free and open-source project to develop a cross-platform compiler and runtime environment  i e  virtual machine  for the language

[c#] What are the correct version numbers for C#?

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