public static Rectangle GetClientRect(IntPtr hWnd)
        {
            RECT bnds = new RECT();

            if (Api_User32.GetClientRect(hWnd, ref bnds))
            {
                return(new Rectangle(bnds.left, bnds.top, bnds.Width, bnds.Height));
            }
            else
            {
                return(Rectangle.Empty);
            }
        }