Step 1 :
Open ASP.Net web application
Step 2 :
Enable tool box window. Right click on tool box window, select “Add Tab”, rename it as “AJAX Controls”
Step 3 :
Select AJAX controls tab, right click and select choose items. With this process it will open a choose tool box items window. Click on browse button. It will open a window. Here navigate towards the AJAX controls tool kit “.dll” file , click “Open” and click “Yes”.
Step 4 :
With this process with in the ASP.Net tool box window for AJAX controls tab a collection of AJAX will be added.