AJAX Extension Controls

AJAX extension controls Enable you to enhance a Web site by using AJAX capabilities such as asynchronous postbacks.

The concepts behind Ajax have been around for many years. Browsers since Internet Explorer 5 have shipped with the XMLHttpRequest object allowed you to make calls to the server from JavaScript to send and receive date. However, people also used other techniques to emulate the behavior of what is now called Ajax, including Macromedia Flash, iframe elements, or hidden frames.

The Controls are

ScriptManager
ScriptManagerProxy
Timer
UpdatePanel
UpdateProgress