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I'm trying to create a Web API following this link . I have exactly added the way it is shown in this article.

But after adding the controller, it is giving me this error for System.Web.Http and ApiController.

Error message on System.Web.Http :

The type or namespace Http doesn't exist in the namespace 'System.Web'

Error message on ApiController:

The type or namespace ApiController could not be found.

Additional Information :

I'm using Visual Studio 2015 Professional. Framework : .NET Framework 4.6.1

I have searched a lot about this issue but couldn't find anything solution.I'm sure i'm missing very small details somewhere but can anyone help me here.
Thanks a lot in advance.

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  • did you add the system.web library as a reference in your project? Commented Jan 8, 2019 at 6:28
  • check if System.Web and System.Web.Http is present in references. Did you select web api project at the time of project creation? Commented Jan 8, 2019 at 6:36
  • I have System.Web in the references list. But System.Web.Http is with a warning (yellow) symbol. So I'm guessing it is not able load. Commented Jan 8, 2019 at 6:41
  • Also , I tried to search System.Web.Http in the references window. I couldn't find it. Commented Jan 8, 2019 at 6:44
  • @t-prisar , I have selected Empty Template. Then in 'Add Folders and Core references' I checked Web API Commented Jan 8, 2019 at 6:48

1 Answer 1

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It turns out that to get System.Web.Http, I need to install package - Microsoft.AspNet.WebApi.Core from Nuget. After installing, it solved my problem.

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