ASP.NET AJAX Controls & Extenders :
A free ASP.NET AJAX control library that has also been submitted to be included within the AJAX Control Toolkit.
The prompt control builds upon the ASP.NET AJAX framework and derives from the “ScriptControl” server-side class and the “Sys.UI.Control” client-side class. The prompt control also utilizes extender controls with client-side behaviors. The prompt control replaces the traditional JavaScript alerts() and confirm() dialogs and mimics the functionality typically exposed in a Windows Form MessageBox....
