An control allows you to present a picture as a clickable control.
If you want to create an image with clickable regions, you can use the control.
To create a graphical button
<asp:ImageButton>element into the page.
Set the button's property to point to an image file (for example, .gif or .jpg).
You can point to an image file anywhere using a URL or UNC path.
The URL associated with an ImageButton control can be tampered with by a malicious user. For more information, see How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings.