[C#] 폼을 마우스 드래깅으로 이동하기

private const int WM_NCHITTEST  = 0x84;
private const int HTCLIENT      = 0x1;
private const int HTCAPTION     = 0x2;

protected override void WndProc(ref Message m)
{
    switch (m.Msg)
    {
        case WM_NCHITTEST:
            {
                base.WndProc(ref m);
                if ((int)m.Result == HTCLIENT)
                {
                    m.Result = (IntPtr)HTCAPTION;
                }
                return;
            }
            break;
    }

    base.WndProc(ref m);
}

출처: http://support.microsoft.com/kb/320687/en-u

Original Post : http://neodreamer-dev.tistory.com/704