為了美觀，自己用Panel做了一個標題欄，如下圖白色的上邊欄，直接貼程式碼

        /// <summary>
        /// 滑鼠左鍵按下
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panel3_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isMouseDown 
 
= true;
                FormLocation = this.Location;
                mouseOffset = Control.MousePosition;
            }
        }
        /// <summary>
        /// 滑鼠移動
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private
 
 void panel3_MouseMove(object sender, MouseEventArgs e)
        {
            int x = 0;
            int y = 0;
            if (isMouseDown)
            {
                Point pt = Control.MousePosition;
                x = mouseOffset.X - pt.X;
                y = mouseOffset.Y - pt.Y;

                
 
this.Location = new Point(FormLocation.X - x, FormLocation.Y - y);
            }
        }
        /// <summary>
        /// 滑鼠左鍵鬆開
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panel3_MouseUp(object sender, MouseEventArgs e)
        {
            isMouseDown = false;//全域性變數防止滑鼠沒有按下左鍵窗體也跟著移動
        }