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Response.Clear();
Point[] points=new Point[5];
Bitmap image=new Bitmap(300,300);
Graphics g=Graphics.FromImage(image);
points[0]=new Point(10,20);
points[1]=new Point(110,202);
points[2]=new Point(210,220);
points[3]=new Point(220,160);
points[4]=new Point(10,20);
g.DrawPolygon(Pens.Black,points);
image.Save(Response.OutputStream);