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How to keep ModalPopupExtender after full PostBack?

April 26, 2017modalpopupextender postback

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How to keep ModalPopupExtender after full PostBack?

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When a ModalPopupExtender is already opened, it will be closed after a full PostBack. This’s because its client side state(opened or hidden) isn’t maintained automatically. As a result, it will always be hidden initially after a full PostBack. To solve this, we have following options: • Avoid using full PostBack by putting an UpdatePanel inside the ModalPopup. • Save and restore its state manually on client side. Below are two examples for each option: Option 1: <%@ Page Language="C#" %> Untitled Page