private bool _isDown;

        private Point _mousePoint;

        private void Users_MouseDown(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left) _isDown = true;

            _mousePoint = new Point(-e.X, -e.Y);

        }

        private void Users_MouseUp(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left) _isDown = false;

        }

        private void Users_MouseMove(object sender, MouseEventArgs e)

        {

            if (!_isDown) return;

            var wz = Control.MousePosition;

            wz.Offset(_mousePoint);

            Location = wz;

        }