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Show Message Box when application is in background

I need to show a Message box for user with two buttons(open application, cancel) when an application is in background. How can I realise it (should it be a background task) ?

You can't show custom message box from background.

As a workaround you can show Toast Notification from Background Agent . Look at ShellToast , it's made for this purpose. When toast appears, users can tap it to open application as you need.

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