default.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;
//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

namespace ValidationCode
{

    public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
    {
        private string result;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                string cbReference = Page.ClientScript.GetCallbackEventReference(this, "text", "ReceiveServerData", "");   //获取一个对客户端函数的引用；调用该函数时，将启动一个对服务器端事件的客户端回调。
                string callbackScript = "function dos(text){" + cbReference + ";}";                                        //注册客户端方法
                Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "dos", callbackScript, true);                  //向客户端写入脚本块
            }
        }
        /**/
        /// <summary>
        /// 处理回调事件。 
        /// </summary>
        /// <param name="text"></param>
        public void RaiseCallbackEvent(string text)
        {
            string checkcode = (string)Session["Code"];
            string[] j = text.Split(new char[] { '&' }, 3);
            if (j[2] != checkcode)
                result = "验证码错误！请重新输入";
            else if (j[0] == "123" && j[1] == "123")
                result = "登陆成功！";
            else
                result = "登陆失败！";
        }
        /**/
        /// <summary>
        /// 返回回调事件的结果。 
        /// </summary>
        /// <returns></returns>
        public string GetCallbackResult()
        {
            return result;
        }


    }
}