// Draw the Line that is cross
private void DrawReversibleLine(Point p)
{
ControlPaint.DrawReversibleLine(
PB_FS.PointToScreen(new Point(0, p.Y)),
PB_FS.PointToScreen(new Point(PB_FS.Width, p.Y)),
Color.Red);
ControlPaint.DrawReversibleLine(
PB_FS.PointToScreen(new Point(p.X, 0)),
PB_FS.PointToScreen(new Point(p.X, PB_FS.Height)),
Color.Red);
}