System.Web.Mvc.HttpPostAttribute vs System.Web.Http.HttpPostAttribute? [duplicate]

Question

In my Web API project which is based on the ASP.NET MVC, I want to use the HttpPost attribute. When I've added that onto the action, The IntelliSense suggests me these two namespaces:

• System.Web.Mvc.HttpPostAttribute
• System.Web.Http.HttpPostAttribute

Which one should be used and why?

Answer 1

Prior to ASP.NET Core, MVC and WebAPI were mainly separate libraries.

The .Mvc namespace applies to MVC controllers, the .Http namespace to Web API controllers.