An UpdatePanel control defined on a page. Button control is placed outside of the UpdatePanel .How to cause the UpdatePanel to execute an update.

Options
- Set the Trigger attribute of the UpdatePanel to the ID of the Button control.
- Set the AsyncPostBackTrigger attribute of the Button control to the ID of the UpdatePanel.
- Place the button control on the update panel without script manager.
- Add an AsyncPostBackTrigger control to the Triggers section of the UpdatePanel. Set the ControlID attribute of the AsyncPostBackTrigger control to the ID of the Button control.

CORRECT ANSWER : Add an AsyncPostBackTrigger control to the Triggers section of the UpdatePanel. Set the ControlID attribute of the AsyncPostBackTrigger control to the ID of the Button control.

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