Need to add a 'Ruler' to a .Net textbox (windows forms application)

using System;
using System.Drawing;
using System.Windows.Forms;

namespace _27639257
{
    public partial class RulerBox : UserControl
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="RulerBox"/> class.
        /// </summary>
        public RulerBox()
        {
            InitializeComponent();
            this.label1.Left = this.textBox1.ClientRectangle.Left;
        }

        /// <summary>
        /// Handles the FontChanged event of the RulerBox control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        private void RulerBox_FontChanged(object sender, EventArgs e)
        {
            this.textBox1.Font = this.label1.Font = this.Font;
        }

        /// <summary>
        /// Handles the Paint event of the label1 control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Forms.PaintEventArgs"/> instance containing the event data.</param>
        private void label1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            SizeF sizeofW = g.MeasureString("W", this.Font, 0, StringFormat.GenericTypographic);
            float halfWidth = (sizeofW.Width / 2F);
            float halfHeight = (sizeofW.Height / 2F);

            for (float i = (halfWidth + (this.textBox1.Bounds.Left - this.textBox1.ClientRectangle.Left)), x = 1; i < this.ClientRectangle.Width; i += sizeofW.Width, x++)
            {
                if (x % 10 == 0)
                {
                    g.DrawString(x.ToString(), this.Font, Brushes.Black, (i - halfWidth), 1);
                    g.DrawLine(Pens.Black, i, halfHeight + 5, i, this.label1.ClientRectangle.Height);
                }
                else
                {
                    g.DrawLine(Pens.Black, i, halfHeight + 8, i, this.label1.ClientRectangle.Height);
                }
            }
        }

        /// <summary>
        /// Performs the work of setting the specified bounds of this control.
        /// </summary>
        /// <param name="x">The new <see cref="P:System.Windows.Forms.Control.Left"/> property value of the control.</param>
        /// <param name="y">The new <see cref="P:System.Windows.Forms.Control.Top"/> property value of the control.</param>
        /// <param name="width">The new <see cref="P:System.Windows.Forms.Control.Width"/> property value of the control.</param>
        /// <param name="height">The new <see cref="P:System.Windows.Forms.Control.Height"/> property value of the control.</param>
        /// <param name="specified">A bitwise combination of the <see cref="T:System.Windows.Forms.BoundsSpecified"/> values.</param>
        protected override void SetBoundsCore(int x, int y, int width, int height, BoundsSpecified specified)
        {
            base.SetBoundsCore(x, y, width, this.textBox1.Height + this.label1.Height, specified);
        }

        /// <summary>
        /// Handles the Resize event of the RulerBox control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
        private void RulerBox_Resize(object sender, EventArgs e)
        {
            this.label1.Width = this.textBox1.Width = this.Width;
        }
    }
}

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