Form ohne Rahmen verschieben

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protected override void WndProc(ref Message m)
        {
            const int WM_NCHITTEST = 0x84;
            const int HTCAPTION = 0x02;

            if (m.Msg == WM_NCHITTEST)
            {
                m.Result = (IntPtr)HTCAPTION;
            }
            else
            {
                base.WndProc(ref m);
            }
        }