Applying AJAX from my previous webforms

Well you dont need to redo all the pages just add the Ajax.dll into the project and then where ever you wish to insert the Ajax functionality just make few cahnges to your control.

I guess that this article would be helpful for you.

http://ajax.asp.net/docs/tutorials/IScriptControlTutorial1.aspx

1)
Is your old webforms a .NET v1.1 or .NET v2.0?
ASP.NET AJAX runs with .NET v2.0 and I do not know if it's compatible with .NET v1.1 or not. If you run .NET v1.1 then you need to search around.

From here on, I assume it's a .NET v2.0

2)
You need to download ASP.NET Ajax framework and install it on your development system

3)
You need to update your config file to match the AJAX config file. The easiest way to do is to create a new AJAX web project. Copy what is needed in your old web config file to the new Ajax web config file. Then copy the new config file back to your old web project.

4) From here on, you are ready to add your ajax to your old webforms. If you need AjaxControlToolKit, you need to drop the AjaxControlToolkit.dll into your bin. The rest of the dlls are in the GAC when you install the AJAX Framework.

Hope this helps ... CHEER ...