Finding ModalPopupExtender with Code Behind (c#)

Question

OK so I have 3 different ModalPopupExtenders on my page each with their own Panel. The Panels all have a Cancel button. When the user clicks on the Cancel button I want to execute a code behind function. I dont want to use the MPE CancelControlID as this only hides the modal popup and the OnClick of the Cancel button does not get called. So what I want to do is have a Cancel button with OnClick=CancelClicked Amongst other things I want the CancelClicked function to hide the associated modal popup. How can I do this without explicitly naming the modal popup (because the function can be called from any of the 3 modals). I'm assuming that the object sender needs to be used but how? Thanks

Gary King · Answer

OK so I have managed to get the Button's ID and furthermore the Button's Panel ID. The problem is that the Panel has no relationship back to the MPE (although the panel has a relationship to the panel via the PopupControlID property). Therefore I don't think that it is possible to do exactly what I want to do the way that I thought it could be done. You further suggestion to use the CancelControlID will not work either because if you define a CancelControlID then the OnClick function of the button itself will not execute. However I do have a workaround..... If I use similar ID's for both the MPE and the Button then I can use string manipulation to hide the MPE. For example MPE ID = mpeSomething and Cancel button ID = btnCancelSomething. All I have to do is get the button ID as string replace btnCancel with mpe cast the result as type MPE and then Hide it.

Vulpes · Answer

Sorry I should have read the question more carefully. You can get the button which is clicked like this: Button btn = (Button)sender; string ID = btn.ID; If you then compare this ID with the CancelControlId property of the 3 ModalPopupExtenders you can deduce one which of the three is applicable.

Gary King · Answer

Firstly I'm not sure how to cast 'sender' to ModalPopupExtender. Also surely the sender is actually the button not the MPE. So please could you ellaborate on how this can be achieved (code sample would be greatly appreciated) protected void ModalCancelClicked( object sender EventArgs e) { ??? }

Vulpes · Answer

You'll need to cast 'sender' to ModalPopupExtender and then examine its ID property to see which one of the three called it.