This simply returns the appropriate WaitPage URL for the currently registered ITaskWaiter. It is the responsibility of the calling WebForm to perform the redirection to this URL.
the appropriate WaitPage URL
This version of StartWaiting is useful in cases where the WebForm needs to do some extra work before redirecting to the WaitPageURL. For example, it may want to preserve the current state of the page, which may require that a redirect needs to be delayed until certain ASP.NET events have occurred.