I was trying to apply AsyncTimeout attribute on my Async aciton of a Async controller.  It looks like not able to produce a TimeoutException.  Does anyone know how to use this attribute?

Here is my sample code for testing this attribute:

using System;
using System.Web.Mvc;
using System.Threading;


namespace MvcApplication1.Controllers
{
    public class HomeController : AsyncController
    {
        [AsyncTimeout(2)]
        public void IndexAsync()
        {
            Thread.Sleep(3000);
        }


        public ActionResult IndexCompleted()
        {
            return View();
        }
    }
}