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    private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
    {
      //Zeichnen...
      Graphics g = panel1.CreateGraphics();
      g.Clear(Color.White);
      if (checkBox1.Checked)
        g.SmoothingMode = SmoothingMode.HighQuality; //AntiAlias
      else
        g.SmoothingMode = SmoothingMode.None;
      Pen p = new Pen(Color.Black, 1);
      Pen p2 = new Pen(Color.Red, 1);
      g.DrawLine(p, panel1.Width / 2, 0, panel1.Width / 2, panel1.Height);
      g.DrawLine(p, 0, panel1.Height / 2, panel1.Width, panel1.Height / 2);
      g.DrawEllipse(p2, panel1.Width / 4, panel1.Height / 4, panel1.Width / 2, panel1.Height / 2);
      if (checkBox1.Checked)
        g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
      else
        g.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;
      g.DrawString("Test", new Font("Verdana", 16), new SolidBrush(Color.Black), 10, 10);

    }