User control in updatepanel not updating
Then user can perform an action that does partial update inside the Modal Popup.
You will only need one Modal Popup Extender control by using this design.
To implement that you need to add 4 "things" in your ASP. You need a textbox to store the value you want to pass over to the Update Panel, but you don't want to show it in the page, so it must be hidden via CSS.
You see that I registered an Async Post Back Trigger on the Click event of the button.
NET Update Panel inside Modal Popup, it also shows a way of having multiple dynamically created controls that act as triggers to show Modal Popup, and the content of Modal Popup will change depending on the control that triggered the Popup.With the Update Panel in place, any postback caused by a control within the Update Panel is converted into a partial page postback.Like with a full page postback, a partial page postback sends a request back to the server but does so through client-side script.The server-side event fired and updates the label control text, after the “Choose” button has been clicked.In the code above it shows the Modal Pop Extender that “pnl Modal Pop Up Panel” is attached to has a hidden Target Control (“dummy” button).
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I also added a label that will be updated by the event raised by the textbox.