App_Code/ValidateCode.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using CommonLib;
using System.Drawing;

/// <summary>
/// ValidateCode 的摘要说明

/// </summary>
public class ValidateCode
{
    private static string GenerateCheckCode()
    {
        int number;
        char code;
        string checkCode = String.Empty;

        System.Random random = new Random();

        for (int i = 0; i < 5; i++)
        {
            number = random.Next();

            //if (number % 2 == 0)
            code = (char)('0' + (char)(number % 10));
            //else
            //code = (char)('A' + (char)(number % 26));

            checkCode += code.ToString();
        }
        CookieHelper.AddCookies("CheckCode", checkCode);
        return checkCode;
    }

    public static void CreateCheckCodeImage(string checkCode)
    {
        if (checkCode == null || checkCode.Trim() == String.Empty)
            return;

        System.Drawing.Bitmap image = new System.Drawing.Bitmap((Int32)Math.Ceiling((decimal)(checkCode.Length * 12)), 22);
        Graphics g = Graphics.FromImage(image);

        try
        {
            //生成随机生成器

            Random random = new Random();

            //清空图片背景色

            g.Clear(Color.White);

            //画图片的背景噪音线