You use the UpdatePanel control to define a region of a Web page that will participate in partial-page postbacks. To do this, you place any HTML or ASP.NET controls that you want to be part of the update region inside the child element of the UpdatePanel control. If one of these contained controls, for example a Button control, triggers a postback, then the content of the UpdatePanel control will be updated independently of the rest of the page.You can have multiple UpdatePanel controls on a page that can be updated individually, or as a result of an external trigger.
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