第二种/验证码.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
using System.IO;

namespace 验证码
{
    public partial class 验证码 : System.Web.UI.Page
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string tmp = RndNum(4);

                HttpCookie a = new HttpCookie("ImageV ", tmp);

                Response.Cookies.Add(a);

                this.ValidateCode(tmp);
            }
        }
        private void ValidateCode(string VNum)
        {

            Bitmap Img = null;

            Graphics g = null;

            MemoryStream ms = null;

            int gheight = VNum.Length * 12;

            Img = new Bitmap(gheight, 25);

            g = Graphics.FromImage(Img);

            //生¦¨²成¨¦随?机¨²生¦¨²成¨¦器¡Â 

            Random random = new Random();

            //背À3景¡ã颜?色¦?

            g.Clear(Color.Orange);

            //for (int i = 0; i < 25; i++)

            //{

            //    int x1 = random.Next(Img.Width);

            //    int x2 = random.Next(Img.Width);

            //  int y1 = random.Next(Img.Height);