2D Graphics C#

using System;
using System.Drawing;
using System.Windows.Forms;
   
class TryOneInchEllipse: Form
{
     public static void Main()
     {
          Application.Run(new TryOneInchEllipse());
     }
     public TryOneInchEllipse()
     {
          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)
     {
          grfx.DrawEllipse(new Pen(clr), 0, 0, grfx.DpiX, grfx.DpiY);
     }
}