NullReferenceException in DestroyWindow on dialog close

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Wyatt - 12 Jan 2005 19:15 GMT

One of my users is getting a NullReferenceException (Object reference not set
to an instance of an object) when they hit the Ok button on one of my dialogs.

Below is the exception's stack trace:

at System.Windows.Forms.UnsafeNativeMethods.IntDestroyWindow(HandleRef hWnd)
at System.Windows.Forms.UnsafeNativeMethods.DestroyWindow(HandleRef hWnd)
at System.Windows.Forms.NativeWindow.DestroyHandle()
at System.Windows.Forms.Control.DestroyHandle()
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at System.Windows.Forms.Form.ShowDialog()

The form does contain a ActiveX control, although I'm not sure if it makes a
difference. I seem unable to reproduce the error on other machines. What
could this error be caused by?

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Wyatt - 14 Jan 2005 22:21 GMT

It appears calling Dispose() on the activex control during the Closing event
will fix this. Why, I have no idea.

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