WebSite/Tool/CheckImage.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

public partial class Tool_CheckImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        CreateCheckCodeImage(GenCode(4));
    }

    /**/
    /// <summary>
    /// '产生随机字符串
    /// </summary>
    /// <param name="num">随机出几个字符</param>
    /// <returns>随机出的字符串</returns>
    private string GenCode(int num)
    {
        string[] source = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
        string code = "";
        Random rd = new Random();
        int i;
        for (i = 0; i < num; i++)
        {
            code += source[rd.Next(0, source.Length)];
        }
        return code;

    }

    /**/
    /// <summary>
    /// 生成图片（增加背景噪音线、前景噪音点）
    /// </summary>
    /// <param name="checkCode">随机出字符串</param>
    private void CreateCheckCodeImage(string checkCode)
    {
        if (checkCode.Trim() == "" || checkCode == null)
            return;
        Session["Code"] = checkCode; //将字符串保存到Session中，以便需要时进行验证
        Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));// 使用Cookies取验证码的值

        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 15), 22);
        Graphics g = Graphics.FromImage(image);
        try
        {
            //生成随机生成器
            Random random = new Random();