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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
private XmlDocument xmlDoc;
        //load xml file
        private void LoadXml()
        {
            xmlDoc=new XmlDocument();
            xmlDoc.Load(Server.MapPath("User.xml"));
        }
        //Ìí¼Ó½Úµã
        private void AddElement()
        {
            
            LoadXml();
            XmlNode xmldocSelect=xmlDoc.SelectSingleNode("user");
            
            XmlElement el=xmlDoc.CreateElement("person"); //Ìí¼Óperson½Úµã
            el.SetAttribute("name","·çÔÆ"); //Ìí¼Óperson½ÚµãµÄÊôÐÔ"name"
            el.SetAttribute("sex","Å®");   //Ìí¼Óperson½ÚµãµÄÊôÐÔ "sex"
            el.SetAttribute("ag


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public string Login(string name)
{
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