AsyncTaskDelegate Reference missing Asp.Net 4.0
<p>I'm trying to implement "PageAsyncTask" in asp.net 4.0.When i tried to declare "AsyncTaskDelegate" it showed a design time error.I checked the library reference.System.Web and Remoting are referenced but im still not able to figure out why it's missing.</p>

<p>And </p>

<p>AsyncMethodCaller caller = new AsyncMethodCaller(someMethod);
When i tried to invoke "caller.BeginInvoke" , Intellisense did not show me BeginInvoke nor EndInvoke.Am i missing any other library reference in my project?</p>
