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RegisterPostBackControl Method (control)
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Registers a control for postback. This method is used for postback controls inside an UpdatePanel control that would otherwise perform asynchronous postbacks.

This method is not very well know, but quite useful for scenarios where you need perform a full postback on a button that is inside of an UpdatePanel

You don't have to fight anymore to fit outside from the UpdatePanel that full postback button, and you can activate just by adding one line of code in your codebehind.