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Why does my application crash upon closing,If I had previously closed a model child form which contains DockingManager?

Platform: WinForms |
Control: DockingManager |
Published Date: April 30, 2011 |
Last Revised Date: July 10, 2014


This crash will occur only if we had closed a child form which was called by using ShowDialog method.The reason is that ,when we close a form which was called by ShowDialog method,it's Dispose method will not get called.In this sutuation when we close main form, the application will crash.

The workaround is to dispose the docking manager explicitly in the Form_Closing event handler of child form.


// Form's Closing event handler

private void ChildForm_Closing(object sender, System.ComponentModel.CancelEventArgs e) {




' Form's Closing event handler

Private Sub ChildForm_Closing(sender as object ,e as System.ComponentModel.CancelEventArgs) handles ChildForm.Closing


End Sub

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