protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);

    //Load a bitmap and create a new one to draw a sub bitmap
    Bitmap greenRed = (Bitmap)Bitmap.FromFile("greenred.bmp");
    Bitmap destImage = new Bitmap(20, greenRed.Height);

    //Grab the drawing surface for the new image
    Graphics destGraphics = Graphics.FromImage(destImage);

    //Draw the old one into the new ones smaller space
    destGraphics.DrawImage(greenRed, 0, 0);

    //Draw both on the screen
    e.Graphics.DrawImage(greenRed, new Point(0, 0));
    e.Graphics.DrawImage(destImage, new Point(100,0));
}