Use the color of Window and WindowText from SystemColors

   

using System;
using System.Drawing;
using System.Windows.Forms;
   
class HuckleberryFinn: Form
{
     public static void Main() 
     {
          Application.Run(new HuckleberryFinn()); 
     }
     public HuckleberryFinn()
     {
          Text = ""The Adventures of Huckleberry Finn"";
          BackColor = SystemColors.Window;
          ForeColor = SystemColors.WindowText;
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          pea.Graphics.DrawString("some stretchers, as I said before.", Font, new SolidBrush(ForeColor), ClientRectangle);
     }
}