Why is System.Web.Mvc not listed in Add References?

Question

Using C#, Visual Studio 2010.

There is a namespace called System.Web.Mvc documented on MSDN. The documentation for all the types in that namespace says that they are

Answer 1

I didn't get System.Web.Mvc in VS 2012 but I got it in VS 2013. Using AddReference Dialog,

Or, You can find this in your project path,

YourProjectName\packages\Microsoft.AspNet.Mvc.5.0.0\lib\net45\System.Web.Mvc.dll