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How can I disable the close button of a form like in the image below? (the image below show a MessageBox window)
The MessageBox above was generated by me! I want to disable the close button of a normal form.
You handle the Closing event (and not the Closed event) of the Form.
And then you use e.CloseReason to decide if you really want to block it (UserClose) or not (TaskManager Close).
Also, there is small example Disabling Close Button on Forms on codeproject.