.NET : MessageBox appears in background

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Hi Guys.

I have a problem with my application.

All MessageBox are shown in background behind the application. The form owner of messagebox is not TopMost. can anyone think of a solution why this is happening?

Thanks

Posted 14-Sep-11 5:20am

Eli Nurman

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Dylan Morley 14-Sep-11 11:32am

Are you doing anything with threading?

Can you post the code that you are using to show the message box (the routine, not just the single line!)

Eli Nurman 14-Sep-11 13:12pm

I am not threading at all
Using the following code:
MessageBox.Show(MainForm, Q, "", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
Also
MessageBox.Show(null, Q, "", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
does not seem to help

2 solutions

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BobJanova · Answer 1 · 2011-09-14T05:48:00

Message boxes appear on top of everything else within the same thread. Getting a message box behind some other controls indicates that the message box is created on a different thread to the form which can be moved over it.

If you're threading (including asynchronous I/O, sockets etc; background workers; thread pools; and .Net 4 Tasks), you should use BeginInvoke (or Invoke, if you want the thread method to stall while the message box is up) to call UI functionality like spawning message boxes.

BeginInvoke is on any Control in WinForms, or through the Dispatcher in WPF.

skv_lviv · Answer 2 · 2011-09-14T06:49:00

Solution 2

You may try overload which accepts IWin32Window (in case of System.Windows.Forms.MessageBox) or Window (in case of System.Windows.MessageBox).

Posted 14-Sep-11 6:49am

skv_lviv