2D Graphics C# Tutorial

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using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
   
class PrintableForm: Form
{
     public static void Main()
     {
          Application.Run(new PrintableForm());
     }
     public PrintableForm()
     {
          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)
     {
          Point[] apt = {new Point(0,      0),
                         new Point(cx - 1, 0),
                         new Point(cx - 1, cy - 1),
                         new Point(0,      cy - 1),
                         new Point(0,      0)};
   
          grfx.DrawLines(new Pen(clr), apt);
     }
}