ControllerAction attribute

Hi


I am reading an article regarding the ASP.NET MVC from SCOTTGU blog. In the article there is a code in which [ControllerAction] attribute is defined over the method. But when I do that I can getting compile time error - "The type or namespace name 'ControllerActionAttribute' could not be found (are you missing a using directive or an assembly reference?)"

But I have already included the following namespaces

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

Is there any thing I am missing?


Regards
Karan Gupta