ASP.NET 2.0's Client Callback Feature

(Minh Nguyen) One of the most overlooked features of ASP.NET 2.0, part of Visual Studio 2005 or "Whidbey", is the Client Callback feature. This feature allows you to programmatically call server-side methods through client-side JavaScript code without the need for posting back the page.

This article describes how to use the Client Callback feature to implement your own callback scenario and introduces the new TreeView control that has this feature built in. The code samples in this article were written using the "Whidbey" beta version distributed at the Professional Developer's Conference in late 2003.