Visual Basic Reference

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Form already displayed; can't show modally (Error 400)

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You cant use the Show method to display a form as modal that is already visible. This error has the following cause and solution:

  • You tried to use Show, with the style argument set to 1 - vbModal, on an already visible form.

    Use either the Unload statement or the Hide method on the form before trying to show it as a modal form.