UpdatePanel Client-Side Page Execution Life Cycle
A page that contains a ScriptManager control not only has a server-side page execution life cycle, it also has a client-side page execution life cycle. The following series of events happen on the client-side:
• Application.init—
Raised when a page is first requested. This event is not raised during an asynchronous postback.
• PageRequestManager.initializeRequest—
Raised before an asynchronous request to the server starts.
• PageRequestManager.beginRequest—
Raised before an asynchronous request to the server starts.
• PageRequestManager.pageLoading—
Raised after an asynchronous response is received from the server but before UpdatePanel content is updated.
• PageRequestManager.pageLoaded—
Raised ...
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