Web API cannot resolve symbol Http in System.Web.Http, what is missing?

Question

I have a webforms project. I use nuget to install web API by running `Install-Package WebApi.All` I create a class ``` public class CartController : System.Web.Http.ApiController ``` but it cannot resolve symbol Http in System.Web.Http, what dependency am I missing?

Accepted Answer

The name of the package for the ASP.NET Web API isn't "WebApi.All". The package for the ASP.NET Web API (Beta) is "AspNetWebApi". Try running the following instead:

```
Install-Package AspNetWebApi
```

Web API cannot resolve symbol Http in System.Web.Http, what is missing?

Solution

Problem