AJAX Control Kit was released for Visual Studio 2008 SP1 and .Net Framework 3.5 SP1. There were multiple flavours available. I chose 'AjaxControlToolkit-Framework3.5SP1.zip' which was a full-release package with complete source code to all controls. It does not have an MSI like AJAX Extensions.
I opened the solution in 'Visual Studio 2008' and built the sample web site. The 'AJAXControlToolKit.dll' will be available in the sample web site->bin folder.
(Refer to 'How Do I?' video on http://www.asp.net/Ajax/ajaxcontroltoolkit/ to start).
Problem
Now I faced a challenge to import the AJAX Toolkit controls into VS 2008. In General,
1) Create a new Tab
2) Rename the tab to 'AJAX Toolkit Control'
3) Then Right-Click, select 'Choose Items' and browse to the location where you will find 'AjaxControlToolkit.dll'. Click 'OK'
4) Actually, this has to import all the controls and show you the controls.
But it was not happening. The tab was appearing empty.
Solution
Create a new ASP.NET web site project. With some .aspx page open, click the toolbox and the 'AJAX Toolkit Control' tab. You should find the controls.
Or try to do the steps mentioned in the previous section. This is strange but it worked for me.
Hope this information is useful.
