Backup/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;

namespace ChNValidCode
{
    //作者liudao，下载自http://www.51aspx.com/CV/ZhongWenYanZhengMa
    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] == "51aspx" && j[1] == "51aspx")
            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;
    }


    }
}