Redirecting from override IAsyncResult BeginExecute

I didnt want to use ASP.NET MVC Authentication Manager (wanted something more simple, yet with some options i would like to add / remove) so I created a different one which uses Login Session
In my Administration Area I had created BaseController which I had planned all my child conrollers to inherit from him And I had wondered how do I Redirect an unautherized Login from that BaseController Here is an example:
public class BaseManagementController : Controller { protected override IAsyncResult BeginExecute(System.Web.Routing.RequestContext requestContext, AsyncCallback callback, object state) { //check if user logged in if (!AuthenticateManager.IsLogged()) { //if not logged, throw away //how do i make this line work ? } //some other code //default action return base.BeginExecut ...