MessageBox doesn't show on mdi form after a long calculation

Posted by Rekreativc on Stack Overflow See other posts from Stack Overflow or by Rekreativc
Published on 2010-03-30T10:41:32Z Indexed on 2010/03/30 10:43 UTC
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c#

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mdi

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messagebox

Hello

This is a very similar problem to This one, sadly that one was never answered either.

I have a MDI Main forum that hosts several children forms. One of them does a long calculation and throws an exception if an error occurs (all work is done on the same thread). I then try to inform the user of an error with an messagebox, however it doesn't appear (but steals focus from the MDI Main, so the application is completely unresponsive).

The beheviour changes slightly if I call Application.DoEvents() (evil I know, but this is a last resort thing). Then the forms remain completely active and the messagebox only appears after I change active application (Alt+Tab) to something else and then back again.

What can I do to make sure the messagebox will be visible? I have already tried passing both, active child and MDI Main as parameter to the MessageBox.Show method. It doesn't change the behaviour.

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