Tips while using ASP.NET AJAX
When we use the ASP.NET AJAX, we have to ensure that the extensions are installed if you are using VS 2005. Also you have to ensure that the necessary web.config enteries are there. For the detailed enteries please look at this site http://geekswithblogs.net/ranganh/archive/2007/07/15/113963.aspx This is necessary when you are using the AJAX Toolkit Library. Cheers!!!