private void AddArcExample(PaintEventArgs e)
{

    // Create a GraphicsPath object.
    GraphicsPath myPath = new GraphicsPath();

    // Set up and call AddArc, and close the figure.
    Rectangle rect = new Rectangle(20, 20, 50, 100);
    myPath.StartFigure();
    myPath.AddArc(rect, 0, 180);
    myPath.CloseFigure();

    // Draw the path to screen.
    e.Graphics.DrawPath(new Pen(Color.Red, 3), myPath);
}