#region 移动窗体 移动窗口

        private Point _mousePoint;

        private int topA(Control cc)

        {

            if (cc == null || cc == this) return 0;

            if (cc.Parent == null || cc.Parent == this)

                return cc.Top;

            else

                return topA(cc.Parent) + cc.Top;

        }

        private int leftA(Control cc)

        {

            if (cc == null || cc == this) return 0;

            if (cc.Parent == null || cc.Parent == this)

                return cc.Left;

            else

                return leftA(cc.Parent) + cc.Left;

        }

        private void labTitle_MouseDown(object sender, MouseEventArgs e)

        {

            Control cc = (Control)sender;

            if (e.Button == MouseButtons.Left)

            {

                _mousePoint.X = e.X + leftA(cc);

                _mousePoint.Y = e.Y + topA(cc);

            }

        }

        private void labTitle_MouseMove(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                Top = MousePosition.Y - _mousePoint.Y;

                Left = MousePosition.X - _mousePoint.X;

            }

        }

        #endregion