How to enforce close Message Box of another Thread's before closing Win Form in C#?

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.NET2.0

I've built one small multi threading windows application which is consist of single Win Form. Other than Main Thread, i'm displaying Message Box in new thread which i have created for prompt the permission to do the action. If user Select "Yes" then it'll continue. if "No" then it will close. It's working fine.

But i have problem in when Message Box appears, I shouldn't get capable to close Winform unless i close the Message Box. But in my case it's happening reversal. Even though Message Box Appeared i can able to close win From without closing Message Box which has raised from Created New Thread.
Please guide us. How make to solve this.

Posted 26-Dec-13 22:43pm

mn.sathish

Updated 26-Dec-13 22:50pm

v3

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OriginalGriff · Answer 1 · 2013-12-26T22:58:00

The problem is that the MessageBox is being created on a different thread to the main UI - so despite being Modal, it is't Modal for the UI thread - it only blocks execution on the new thread.

So you can use UI controls perfectly happily while the MessageBox is there - which is after all the point of using separate threads! The trouble is that if you close the main window, the thread code is still running...

Firstly. change the thread from a Thread class to a BackgroundWorker - that way at least if the main window is closed and the application exits, the thread will also be terminated - standard Thread class instances are independent and will continue to run even if the app shuts down. So if you do close your main form, at least the message box will be closed and the thread terminated as well.

If you really want the thread to "freeze" the main window until the message box has been acknowledged by the user, then you will have to have the thread as the UI to display the MessageBox and wait until the UI has had the user acknowledgement before continuing. This is possible, but is rather more involved than just calling MessageBox.Show!