System.Drawing.Graphics.DrawPie C# (CSharp) Method

        public void DrawPie(Pen pen, Rectangle rect, float startAngle, float sweepAngle)
        {
            if (pen == null)
                throw new ArgumentNullException ("pen");
            DrawPie (pen, rect.X, rect.Y, rect.Width, rect.Height, startAngle, sweepAngle);
        }

 private void buttonPie_Click(object sender, System.EventArgs e)
 {
     ReloadImage();
     System.Drawing.Graphics g = imageXView1.Image.GetGraphics();
     g.DrawPie(System.Drawing.Pens.Honeydew, 0, 0, 50, 50, 50, 270);
     imageXView1.Image.ReleaseGraphics(true);
 }