Ajax.NET Professional (AjaxPro) is one of the first AJAX frameworks available for Microsoft ASP.NET and is working with .NET 1.1 and 2.0.
as you are doing directly in .NET.
Setup your web application for AjaxPro
Your first Ajax request
Community and Forum
I've removed the forum here because there is already a forum available at the Google groups with more than 4.000 users:
My blog is available at http://weblogs.asp.net/mschwarz/
where I will write about Ajax news and other .NET related stuff.
for some examples on how to use AjaxPro.