The type or namespace IHttpActionResult not found

Question

This is the first time I am creating a Web API application in ASP.NET MVC4. I opened a new Web API project and added a new controller named \'Product\'. The function given below

Answer 1

To resolve the IHttpActionResult reference error add a reference using NuGet to install the Web API2 Core lib. dll

In solution explorer in the references right click and select manage nuget packages. (if not there install nuget)

In the manage NuGet Packages window on the left side click online then in top right search for API 2.1 and install Microsoft ASP.NET Web API 2.1 Core Libraries. (Once installed the install button will change to a green check)

After that the project will reload and when it's build again the IHttpActionResult reference error will be resolved and the project will build successful. Your question was good and helped me. Hope this answer helps!