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How to show a message box on an invalid filename entered while saving a file using save file dialog

Posted By:      Posted Date: September 14, 2010    Points: 0   Category :Windows Application
Hi all i have written a code to display a message box if invalid characters are entered while saving the file but my message box is not displaying. Actually i will have a save file dialog option to save a file if the filename starts or consists of the following    \\/:*?<>|"  I would like to display a message box as invalid or illegalcharacters in file My code is as follows    Stream myStream;                          SaveFileDialog saveFileDialog1 = new SaveFileDialog();                            saveFileDialog1.InitialDirectory = @"C:\";                          saveFileDialog1.DefaultExt = "txt";                          saveFileDialog1.Filter = "(*.txt)|*.txt";                          saveFileDialog1.FilterIndex = 2;                          saveFileDialog1.RestoreDirectory = true;                            if (saveFileDialog1.ShowDialog() == DialogR

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