Simple Ajax Accordian Control:
You can use Accordion and Accordion Pane Controls to add a really cool and sexy look and feel to your ASP.NET application. I will teach you how to use these controls into your Ajax enabled ASP.NET application.
Now let's start.
Step 1)Take Script Manager on web form first,then take accordian control from Ajax Toolkit.
Step 2)Take panes in that Take Accordian pane.
step 3)in Accordian pane take Header and Content and write code following