Microsoft ASP.NET AJAX Information

Programming, error messages and sample code
ASP.NET AJAX is a set of technologies to add AJAX (Asynchronous JavaScript And XML) support to ASP.NET. It consists of a client-side script framework, server controls, and more.

Microsoft ASP.NET AJAX is installed in the Global Assembly Cache on all web servers (Both AJAX version 1.0 and 3.5 are installed). You can install it directly.