Csharp/C Sharp by API/System.Drawing/SystemPens

SystemPens.FromSystemColor

  
using System;
using System.Drawing;
using System.Windows.Forms;
class XMarksTheSpot : Form {
    public static void Main() {
        Application.Run(new XMarksTheSpot());
    }
    public XMarksTheSpot() {
        Text = "X Marks The Spot";
        ResizeRedraw = true;
    }
    protected override void OnPaint(PaintEventArgs pea) {
        Graphics grfx = pea.Graphics;
        Pen pen = SystemPens.FromSystemColor(SystemColors.ActiveBorder);
        grfx.DrawLine(pen, 0, 0,
                           ClientSize.Width - 1, ClientSize.Height - 1);
        grfx.DrawLine(pen, 0, ClientSize.Height - 1,
                           ClientSize.Width - 1, 0);
    }
}