Guest | ASP.NET
How to enable Ajax Functionality in ASP.NET?
Login to your control panel (WebsitePanel)
Select Web Sites section and click on the website you want to use it with.
Then click on the Extensions tab, and change the ASP.NET from the drop down to "2.0 Integrated Pipeline"
That will allow you to use Ajax without any additional assemblies.
Tips:Ajax functionality is integrated in ASP.NET 3.5 SP1 and does not require any additional downloads.