YKT_EShop/Inc/GetVerifyCode.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;

using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

namespace YKT_EShop.Inc
{
    public partial class GetVerifyCode : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string vNum = this.RndNum(4);
            Session.Add("LoginCode", vNum.Replace(" ", ""));
            this.ValidateCode(vNum);
        }

        private string RndNum(int VcodeNum)
        {
            string[] strArray = "0,1,2,3,4,5,6,7,8,9".Split(new char[] { ',' });
            string str2 = "";
            int num = -1;
            Random random = new Random();
            for (int i = 1; i < (VcodeNum + 1); i++)
            {
                if (num != -1)
                {
                    random = new Random((i * num) * ((int)DateTime.Now.Ticks));
                }
                int index = random.Next(9);
                if ((num != -1) && (num == index))
                {
                    return this.RndNum(VcodeNum);
                }
                num = index;
                str2 = str2 + strArray[index] + " ";
            }
            return str2;
        }

        private void ValidateCode(string VNum)
        {
            Bitmap image = null;
            Graphics graphics = null;
            MemoryStream stream = null;
            int width = 40;
            image = new Bitmap(width, 0x10);
            graphics = Graphics.FromImage(image);
            graphics.Clear(Color.MintCream);
            Font font = new Font("Verdana,Arial", 10f);