[System.Runtime.InteropServices.DllImport("user32.dll")]        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);        [System.Runtime.InteropServices.DllImport("user32.dll")]        public static extern bool ReleaseCapture();        private void MoveControl(Control sender, MouseEventArgs e)        {            if (e.Button == MouseButtons.Left && e.Clicks == 1)            {                ReleaseCapture();                SendMessage(sender.Handle, 161, 2, 0);                SendMessage(sender.Handle, 0x0202, 0, 0);            }            else            {                //添加双击或右击代码……            }        }        private void button3_MouseDown(object sender, MouseEventArgs e)        {            MoveControl(sender as Control, e);        }