protected void Page_Load(object sender, EventArgs e)
{
    Random Rand = new Random();
    int iNum = Rand.Next(10000, 99999);
    Bitmap Bmp = new Bitmap(90, 50);
    Graphics Gfx = Graphics.FromImage(Bmp);
    Font Fnt = new Font("Verdana", 12, FontStyle.Bold);
    Gfx.DrawString(iNum.ToString(), Fnt, Brushes.Yellow, 15, 15);
    // Create random numbers for the first line 
    int RandY1 = Rand.Next(0, 50);
    int RandY2 = Rand.Next(0, 50);
    // Draw the first line 
    Gfx.DrawLine(Pens.Yellow, 0, RandY1, 90, RandY2);
    // Create random numbers for the second line
    RandY1 = Rand.Next(0, 50);
    RandY2 = Rand.Next(0, 50);
    // Draw the second line
    Gfx.DrawLine(Pens.Yellow, 0, RandY1, 90, RandY2);
    Bmp.Save(Response.OutputStream, ImageFormat.Gif);
    Session["Number"] = iNum;
}