How to Add Ajax control In Asp .Net

this tutorial help to add all ajax control in visual studio

1. first add the new tab in ToolBox- Ajax Control
2. Right click on Ajax Control Tab.

3. Choose items and browse the ajaxcontroltoolkit.dll  from your Computer.

4. select the Accordian & Accordian Pane tab . OK!

Now All Ajax Control add in your ToolBox Tab.

this post is very helpfull for you .