Custom control does not work in C#....

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C#

WinForms

custom-controls

I want to create a custom label control, which display one seven segment number.
when i set the digit value to display It does not works...
My code is -:
This is custom control code -->

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

namespace SevenSegmentDigit
{
    public partial class DigitDisplay : Label
    {
        Graphics grx;
        Pen roundPen;
        public DigitDisplay()
        {
            InitializeComponent();
            grx = this.CreateGraphics();
            roundPen = new Pen(Brushes.Black, 2);
            roundPen.StartCap = System.Drawing.Drawing2D.LineCap.Round;
            roundPen.EndCap = System.Drawing.Drawing2D.LineCap.Round;
            this.AutoSize=false;            
        }
        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
            showDigit();
        }

        private void showDigit()
        {
            grx.Clear(this.BackColor);            
            switch (digitValue)
            {
                case 1:
                    drawOne();
                    break;
                case 2:
                    drawTwo();
                    break;
                case 3:
                    drawThree();
                    break;
                case 4:
                    drawFour();
                    break;
                case 5:
                    drawFive();
                    break;
                case 6:
                    drawSix();
                    break;
                case 7:
                    drawSeven();
                    break;
                case 8:
                    drawEight();
                    break;
                case 9:
                    drawNine();
                    break;
                case 0:
                    drawZero();
                    break;
            };
        }
        public int digitValue = 0;
        public int DisplayDigit
        {
            get { return digitValue; }
            set { digitValue = value; showDigit(); }
        }
        private void drawOne()
        {
            grx.DrawLine(roundPen, 30, 10, 30, 24);
            grx.DrawLine(roundPen, 30, 26, 30, 40);
        }


        private void drawTwo()
        {
            grx.DrawLine(roundPen, 14, 10, 29, 10);
            grx.DrawLine(roundPen, 30, 10, 30, 24);
            grx.DrawLine(roundPen, 14, 25, 29, 25);
            grx.DrawLine(roundPen, 14, 26, 14, 40);
            grx.DrawLine(roundPen, 14, 41, 29, 41);
        }

        private void drawThree()
        {
            grx.DrawLine(roundPen, 14, 10, 29, 10);
            grx.DrawLine(roundPen, 30, 10, 30, 24);
            grx.DrawLine(roundPen, 14, 25, 29, 25);
            grx.DrawLine(roundPen, 30, 26, 30, 40);
            grx.DrawLine(roundPen, 14, 41, 29, 41);
        }
        private void drawFour()
        {
            grx.DrawLine(roundPen, 15, 11, 15, 24);
            grx.DrawLine(roundPen, 16, 25, 29, 25);
            grx.DrawLine(roundPen, 30, 10, 30, 24);
            grx.DrawLine(roundPen, 30, 26, 30, 40);
        }
        private void drawFive()
        {
            grx.DrawLine(roundPen, 15, 10, 29, 10);
            grx.DrawLine(roundPen, 15, 11, 15, 24);
            grx.DrawLine(roundPen, 16, 25, 29, 25);
            grx.DrawLine(roundPen, 30, 26, 30, 40);
            grx.DrawLine(roundPen, 15, 41, 29, 41);
        }

        private void drawSix()
        {
            grx.DrawLine(roundPen, 15, 11, 15, 24);
            grx.DrawLine(roundPen, 15, 26, 15, 39);
            grx.DrawLine(roundPen, 16, 25, 29, 25);
            grx.DrawLine(roundPen, 30, 26, 30, 40);
            grx.DrawLine(roundPen, 15, 41, 29, 41);
        }
        private void drawSeven()
        {
            grx.DrawLine(roundPen, 15, 10, 29, 10);
            drawOne();
        }
        private void drawEight()
        {
            grx.DrawLine(roundPen, 15, 10, 29, 10);
            grx.DrawLine(roundPen, 30, 10, 30, 24);
            drawSix();
        }
        private void drawNine()
        {
            grx.DrawLine(roundPen, 15, 10, 29, 10);
            grx.DrawLine(roundPen, 15, 11, 15, 24);
            grx.DrawLine(roundPen, 16, 25, 29, 25);
            drawOne();
        }
        private void drawZero()
        {
            grx.DrawLine(roundPen, 15, 11, 15, 24);
            grx.DrawLine(roundPen, 15, 26, 15, 39);
            grx.DrawLine(roundPen, 15, 41, 29, 41);
            drawSeven();
        }
       
    }
}

I draw it on my form and assign the value it does not display the number....

This is Form Code -->

 private void button1_Click(object sender, EventArgs e)
        {
digitDisplay1.digitValue = 2;            
        }

Thanks in advance.....