Resource/ValidateCode/ValidateImage.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;

public partial class Resource_ValidateCode_ValidateImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.CreateCheckCodeImage(RndNum());
    }

    /// <summary>
    /// 生验验证码
    /// </summary>
    /// <returns></returns>
    private string RndNum()
    {
        int number;
        char code;
        string vCode = String.Empty;
        System.Random random = new Random();
        for (int i = 0; i < 4; i++)
        {
            number = random.Next();
            if (number % 2 == 0)
                code = (char)('0' + (char)(number % 10));
            else
                code = (char)('A' + (char)(number % 26));
            vCode += code.ToString();
        }
        Session["vCode"] = vCode.ToLower();
        return vCode;
    }

    /// <summary>
    //生成验证码Gif图片
    /// </summary>
    /// <param name="checkCode"></param>
    private void CreateCheckCodeImage(string checkCode)
    {
        if (checkCode == null || checkCode.Trim() == String.Empty)
            return;
        System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 20.5)), 36);
        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
            for (int i = 0; i < 25; i++)
            {
                int x1 = random.Next(image.Width);
                int x2 = random.Next(image.Width);
                int y1 = random.Next(image.Height);