chapture image coding

Question

i m using this coding for capture image for registration page it is working in windows form but not working in asp form can anybody tell me how we can convert this coding so that it will be working on asp page because windows form have picture box but asp webform have image control please help me 

 public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            generateImage();

        }

        int value = 0;

        private void generateImage()

        {

            Random random = new Random (); // get a random instance

            value = random.Next(10000, 99999); // get a random value between any range

            var image = new Bitmap(this.pictureBox1.Width, this.pictureBox1.Height); // Get a bitmap

            var font = new Font("TimesNewRoman", 25, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Pixel); // Get a font

            var graphics = Graphics.FromImage(image); // Get a graphics with the bitmap image

            graphics.DrawString(value.ToString (), font, Brushes.Red, new PointF(0, 0)); // Add the value in the graphics

            Pen p = new Pen(Brushes.Orange, 2.0f); // get pen width

            graphics.DrawLine(p, new PointF(0,this.pictureBox1 .Height), new Point(this.pictureBox1.Width,0)); // draw a diagonal line

            graphics.DrawLine(p, new PointF(0,0), new Point(this.pictureBox1.Width , this.pictureBox1.Height)); // draw another diagonal line 

            p.Dispose(); // dispose the pen to avoid memory leak

            graphics.SmoothingMode = SmoothingMode.AntiAlias; // Smoothing the pixel

            graphics.TextRenderingHint = TextRenderingHint.AntiAlias; // Smoothing the text rendering because stem width may differ

            this.pictureBox1.Image = image; // load the image in the picturebox    

        }

        private void button2_Click(object sender, EventArgs e)

        {

            this.generateImage();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if (this.textBox1.Text == value.ToString())

            {

                MessageBox.Show("Inserted value is correct");

            }

            else

            {

                MessageBox.Show("the value you have entered is wrong");

                textBox1.Text = String.Empty;

            }

        }

    }