无边框窗体移动

 
  private int x;
        private int y;
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            this.x = e.X;
            this.y = e.Y;
        }
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                this.Location = new Point(this.Location.X + e.X - this.x, this.Location.Y + e.Y - this.y);
            }
        }