System Net Http missing from namespace using net 4 5

Question

TL  DR  I m new to this language and have no idea what I m doing  here is my class so far   using System  using System Collections Generic  using System Net Http  using System Web  using System Net  using System IO   public class MyClass               private const string URL    https   sub domain com objects json api key 123           private const string data        object      name     Title                public static void CreateObject                         HttpWebRequest request    HttpWebRequest WebRequest Create URL               request Method    POST               request ContentType    application json               request ContentLength   data Length              StreamWriter requestWriter   new StreamWriter request GetRequestStream    System Text Encoding ASCII               requestWriter Write data               requestWriter Close                 try                                  get the response                 WebResponse webResponse   request GetResponse                    Stream webStream   webResponse GetResponseStream                    StreamReader responseReader   new StreamReader webStream                   string response   responseReader ReadToEnd                    responseReader Close                              catch  WebException we                                string webExceptionMessage   we Message                            catch  Exception ex                                   no need to do anything special here                                      static void Main string   args                        MyClass CreateObject                  when I do csc filename cs  I get the following error      The type or namespace name  Http  does not exist in the namespace  System Net   are you missing an assembly reference

User · Answer

In Visual Studio you can use nuget to load the package  Microsoft AspNet WebApi WebHost

User · Answer

You ll need a using System Net Http at the top

User · Answer

Make sure it s referenced in your web config

User · Answer

To solve the problem      Go to your solution explorer   Right click on the project name and choose add Select references and allow the  Net framework 4 5 to finish loading Scroll down and select System Net Http and click ok    Problem solved

User · Answer

With the Nuget Package Manager install Microsoft AspNet WebApi Core  After this  using System Web Http   or if you use VB imports System Web Http

User · Answer

You need to have a Reference to the System Web Http assembly which has the HTTPClient class  your trying to use  Try adding the below line before your class declaration  using System Web Http    If you still get the Error  try doing this in Visual Studio   Right click on the References folder on your project  Select Add Reference  Select the  NET tab  or select the Browse button if it is not a  NET Framework assembly   Double-click the assembly containing the namespace in the error message  System Web Http dll   Press the OK button

User · Answer

HttpClient is new in  net 4 5   You should probably be using HttpWebRequest

User · Answer

NuGet   Microsoft AspNet WebApi Client package

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Assuming that your using Visual Studio 10  you can download an install that includes System Net Http  for Visual Studio 10 here   download MVC4 for VS10  Once you ve installed it  right click on the References folder in the VS Project and then select Add Reference  Then  select the Browse tab  Navigate to the assemblies install path for the MVC4 install  usually in Program Files x86  Microsoft ASP NET ASP NET MVC4 assemblies  and select the assembly named  System Net Http dll   Now you can add your  using System Net Http  at the top of your code and begin creating HttpClient connections

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Visual Studio Package Manager Console   Install-Package Microsoft AspNet WebApi Client

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HttpClient lives in the System Net Http namespace   You ll need to add   using System Net Http    And make sure you are referencing System Net Http dll in  NET 4 5     The code posted doesn t appear to do anything with webClient  Is there something wrong with the code that is actually compiling using HttpWebRequest     Update  To open the Add Reference dialog right-click on your project in Solution Explorer and select Add Reference     It should look something like

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Making the  Copy Local  property True for the reference did it for me  Expand References  right-click on System Net Http and change the value of Copy Local property to True in the properties window  I m using VS2019

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I had this issue after upgrading to  NET Framework 4 7 2  I found out that Nuget package for System Net Http is no longer recommended  Here are workarounds   Single-name references are removed by the SDK Nuget package for System Net Http on  NET Framework 4 7 2 and newer versions

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How I solved it    Open project      Properties   choose  Application   select targeting framework   Net Framework 4 5  Right click on your project -  Add reference Make sure that in  Assemblies  -   Extensions  option  System Net Http  is unchecked Go to  Assemblies  -   Framework  and select  System Net Http  and  System Net Http  options That s all    In my case i had at the beginning  Net 4 0 and  Assemblies  -   Extensions  option  System Net Http  with version 2 0 0 0  After my actions  Assemblies  -   Framework  options  System Net Http  and  System Net Http  had the same 4 0 0 0 version

User · Answer

just go to add reference then add  system net http

User · Answer

For me  it was getting the nuget package Microsoft Net Http   https   blogs msdn microsoft com bclteam p httpclient

[c#] System.Net.Http: missing from namespace? (using .net 4.5)

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