Updating a session variable without postback

An Update Panel can be added to any user control or custom control; however, the page on which these controls are included must also include a Script Manager control with the property Enable Partial Rendering set to true.

There is no limit to the number of Update Panel controls that can be on a page, and they can be nested.Each Update Panel is isolated, so that each can work independently (you can have two Update Panels running at the same time, rendering different parts of the page, independent of the page's postback).The Update Panel control primarily deals with control triggers - by default, any control contained within an Update Panel's that creates a postback is registered as a trigger for the Update Panel.The ability to integrate partial page rendering is integrated into ASP. When you launch your website, you should see that partial rendering is now enabled, because when you click on the button there will be no flicker, nor will there be any change in the page scroll position (this example does not demonstrate that).If you were to look at the rendered source of the page after clicking the button, it will confirm that in fact a post-back has not occurred - the original label text is still part of the source markup, and the label has changed through Java Script.

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