?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.Text;
public partial class Default3 : System.Web.UI.Page,ICallbackEventHandler 
{
    //定義一個全局字符串供callback使用
    string str = "";
    // 定義當callback服務器時回調的方法 
    public void RaiseCallbackEvent(String eventArgument)
    {
        str = "服務器callback得到了您輸入的信息：" + eventArgument  + "<br/>您的IP地址是：";
        str += Request.UserHostAddress;
        str += "<br/>當前服務器的時間：";
        str += DateTime.Now.ToLocalTime();
    }
    // 定義返回給CallBack的字符串 
    public string GetCallbackResult()
    {
        return str;
    } 

}