ASP.NET Web API error after upgrading to Visual Studio 2012 RC: Method not found: 'Void System.Net.Http.Headers.HttpHeaders.AddWithoutValidation

Question

After upgrading to Visual Studio 2012 I can no longer access any of my ApiControllers, the following error is thrown:

Server Error in \'/\' Application.

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Answer 1

step 1 Remove the below references from your project:

System.Net.Http, System.Web.Http, System.Web.Http.WebHost , System.Web.Http.Common & System.Net.Http.Formatting

step 2 Add the above refefrences (except the System.Web.Http.Common & System.Net.Http.Formatting) from Below location

1. C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Packages\Microsoft.AspNet.WebApi.Core.4.0.20505.0\lib\net40

2. C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Packages\Microsoft.AspNet.WebApi.WebHost.4.0.20505.0\lib\net40

3. C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Packages\Microsoft.Net.Http.2.0.20505.0\lib\net40

and add one more new dll Newtonsoft.Json.dll from

1. C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Packages\Newtonsoft.Json.4.5.1\lib\net40