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You can use this control to display status information to the user, while the Update Panel updates its content.In the example below, we use the same to display progress while the Update Panel is updating its content.As shown in the code above, we first get a reference to the Page Request Manager and then wire up the initialize Request and end Request events to execute, when an async postback begins and ends respectively.
The Page Request Manager class handles the partial-page updates of the Update Panel.
For understanding purposes, we have emulated a time consuming operation by setting a delay of 3 seconds by using Thread. In the code shown above, we use the Associated Update Panel ID property of the Update Progress control to associate it with an Update Panel control.