ASP.NET Image Button
Replace standard submit buttons with stylish buttons that sport rounded corners, rich appearances that appear uniformly across browsers, and access key support.
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iButtonControl
The iButtonControl interface enables the button to be used as the default button on the page. You can set the validation group and the PostBackUrl property for it.

Rich Buttons
Design the button UI with text, image, or both.

Built-In Presets
Built-in presets make the button look like various office styles, toolbox, popup menu, and other well-known button types.

Styling
Customize the button by setting rounded corners, focus, hover, pressed, and default appearance settings.