Button inside Update Panel is not triggered, in asp.net

Question

<         


        

Answer 1

Change the UpdatePanel's ChildrenAsTriggers property to true. This will cause any postbacks triggered by the UpdatePanel's child elements to update its content.

EDIT: Just realized that btn_Add is a nested control, so you will have to explicitly call it out as an UpdatePanel Trigger. Add the following to your UpdatePanel markup, after the ContentTemplate:

EDIT #2: To keep your modal popup from closing when an async postback occurs, move the UpdatePanel inside the panel specified by ModalPopupExtender's PopupControlID: