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Syncfusion Feedback
Platform : WinForms
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Category : Form

How can I tell if a form is closed from the controlbox (system menu) or from a call to Form.Close

One way to do this is to override the form’s WndProc method and check for WM_SYSCOMMAND and SC_CLOSE. Looking for WM_CLOSE in the override is not sufficient as WM_CLOSE is seen in both cases. A sample is available for download (C#, VB).

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