[DllImport("User32.dll")]
        public extern static int SendMessage(IntPtr hWnd, uint msg, IntPtr _
          wParam, IntPtr lParam);
 
        [DllImport("user32.dll")]
        static extern int GetScrollPos(IntPtr hWnd, int nBar);
 
        [DllImport("user32.dll")]
        static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool _
          bRedraw);