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Windows Forms Control Validation and allowing form close.

I am using code in my Validating event on a ComboBox to force the user to make a choice, which works, but once the user opens the form then they have to make a choice before they can close it. I was to check if the form is closing, then skip validation... I use the code below to validate...

If String.IsNullOrEmpty(ComboBox1.SelectedItem) Then
            e.Cancel = True
        End If

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SOLUTION

JackOfPH

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rgn2121

ASKER

Okay..that works. I am curious...when I use this validating event with the combo box and I click the red X to close out, the way I have it setup is that the ErrorProvider pops the little message. But when I go to try and make a selection the drop down will open and then close right back unless I click the drop down and hold the mouse button down till I drag onto the selections. Have you ever seen this?

rgn2121

ASKER

You know...I am not sure that solution really works, because if they don't make a selection and they click another control on the form, then it will allow it because I allow ComboBox.SelectedItem=Nothing.
Is there a way to tell if the form is closing without using API?

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rgn2121

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