Problem aborting ASP.Net UpdatePanel or Telerik RadAjaxPanel

I've been trying to solve a problem. I have a rather slow loading set of nested datarepeaters that take a couple minutes to fully render. I need to have a cancel button.

First I tried a simple updatepanel with a cancel button in an updateprogress that performed an abortPostBack. It would hide the updatepane开发者_StackOverflow社区l but wait until the datarepeater was done before you could do anything on the page.

We have the Telerik AJAX controls so, hoping they're more advanced, I've now wrapped it up in a RadAjaxPanel. This seems to have the same issue. I've even tried firing an ajaxManager.ajaxRequest back to the server and setting a bool to try and abort the databinding, but that event isn't caught by the server until the databinding completes.

Any ideas on how to get a responsive cancel to a large set of nested datarepeaters?

I think that you can cancel the ajax request from Telerik ajax panel or ajax manager only before it reaches the server, i.e. inside the OnRequestStart client event of both by setting args.set_cancel(true).

Dick