FormTransferXml/image.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
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.Xml.Linq;

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
//该源码下载自www.51aspx.com(５１aｓｐｘ．ｃｏｍ)


namespace FormTransferXml
{
    public partial class image : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string tmp = RndNum(4);//生成4位的验证码
            Session["valiCode"] = tmp;
            this.ValidateCode(tmp);
        }

        /// <summary>
        /// 随机产生验证码的值
        /// </summary>
        /// <param name="VcodeNum">验证码位数</param>
        /// <returns>产生的验证码的值</returns>
        private  string RndNum(int VcodeNum)
        {
            string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p" +
             ",q,r,s,t,u,v,w,x,y,z";
            string[] VcArray = Vchar.Split(new Char[] { ',' });

            string VNum = "";

            Random rand=new Random ();

            for (int i = 1; i < VcodeNum + 1; i++)
            {
                int t = rand.Next(35);//产生0-35之间的随机数
                VNum += VcArray[t];
            }

            return VNum;
        }

        /// <summary>
        /// 字符串显示样式
        /// </summary>
        /// <param name="VNum">验证码----》字符串</param>
            private  void ValidateCode(string VNum)
        {