Well, drawing an ellipse is easy - but you need to be a bit clearer on
your context; perhaps post what isn't working? But following works:

static class Program {
   static void Main() {
       Application.EnableVisualStyles();
       Application.Run(new MyForm());
   }
}
class MyForm : Form {
   protected override void OnResize(EventArgs e) {
       base.OnResize(e);
       Invalidate();
   }
   protected override void OnPaint(PaintEventArgs e) {
       base.OnPaint(e);
       e.Graphics.DrawEllipse(SystemPens.ControlText,
ClientRectangle);
   }
}

Marc

You may be interested in the GDI+ FAQ and the Beginners Guide to GDI+ which
can be found on my site.

http://bobpowell.net/beginnersgdi.htm

For the GDI+ FAQ see the link in my signature.