2D Graphics C#

using System;
using System.Drawing;
using System.Windows.Forms;
   
class WidePolyline: Form
{
     public static void Main()
     {
          Application.Run(new WidePolyline());
     }
     public WidePolyline()
     {
   
          ResizeRedraw = true; 
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          DoPage(pea.Graphics, ForeColor,ClientSize.Width, ClientSize.Height);
     }       
     protected void DoPage(Graphics grfx, Color clr, int cx, int cy)
     {
          Pen pen = new Pen(clr, 25);
   
          grfx.DrawLines(pen, new Point[] {
                         new Point( 25, 100), new Point(125, 100),
                         new Point(125,  50), new Point(225,  50),
                         new Point(225, 100), new Point(325, 100) });
     }
}