C#

class Drawer : Control
{
  StringFormat sf = StringFormat.GenericTypographic;

  public Drawer()
  {
    Text = "ffffffffffffffffffffffffffffffffffffffffffffffffffffffff";
    BackColor = Color.White;
    Font = new Font(FontFamily.GenericSerif, 24);
  }

  protected override void OnPaint(PaintEventArgs e)
  {
    float h = Font.GetHeight();
    float w = e.Graphics.MeasureString("f", Font, int.MaxValue, sf).Width;
    for (int i = 1; i <= Text.Length;i++)
    {
      e.Graphics.DrawLine(Pens.DimGray, w * i, 0, w * i, h);
    }
    for (int i = 1; i <= Text.Length;i++)
    {
      w = e.Graphics.MeasureString(Text.Substring(0, i), Font, int.MaxValue, sf).Width;
      e.Graphics.DrawLine(Pens.DimGray, w , h, w, h + h);
    }
    e.Graphics.DrawString(Text, Font, Brushes.Black, 0,0, sf);
  }
}