对GOOGLE sitemap.xml网络地图的添加for asp.net1.1

sitemap.xml格式如下

<? xml version="1.0" encoding="UTF-8" ?>
< urlset  xmlns ="http://www.google.com/schemas/sitemap/0.84" >
   < url >
     < loc > http://www.ds168.com/ </ loc >
     < priority > 0.5 </ priority >
     < lastmod > 2008-03-11T08:45:45+00:00 </ lastmod >
     < changefreq > always </ changefreq >
   </ url >
   < url >
     < loc > http://www.ds168.com/ipr/ </ loc >
     < priority > 0.5 </ priority >
     < lastmod > 2008-04-09T06:11+08:00 </ lastmod >
     < changefreq > always </ changefreq >
   </ url >
   < url >
     < loc > http://www.ds168.com/bbs/ </ loc >
     < priority > 0.5 </ priority >
     < lastmod > 2008-04-09T06:11+08:00 </ lastmod >
     < changefreq > always </ changefreq >
   </ url >
</ urlset >

思路是每添加一篇新的文章就会在这个里添加一条数据，以便GOOGLE收录，但做了几天一直出现问题

前台代码

<% @ Page language="c#" Codebehind="InsertXML.aspx.cs" AutoEventWireup="false" Inherits="TheTestXml.xml.InsertXML"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > InsertXML </ title >
         < meta  content ="Microsoft Visual Studio .NET 7.1"  name ="GENERATOR" >
         < meta  content ="C#"  name ="CODE_LANGUAGE" >
         < meta  content ="JavaScript"  name ="vs_defaultClientScript" >
         < meta  content ="http://schemas.microsoft.com/intellisense/ie5"  name ="vs_targetSchema" >
     </ HEAD >
     < body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < asp:textbox  id ="tbUrl"  style ="Z-INDEX: 100; LEFT: 328px; POSITION: absolute; TOP: 80px"  runat ="server" ></ asp:textbox >
             < DIV  style ="DISPLAY: inline; Z-INDEX: 107; LEFT: 216px; WIDTH: 70px; POSITION: absolute; TOP: 168px; HEIGHT: 15px"
                ms_positioning ="FlowLayout" > 更新频率 </ DIV >
             < DIV  style ="DISPLAY: inline; Z-INDEX: 106; LEFT: 216px; WIDTH: 70px; POSITION: absolute; TOP: 128px; HEIGHT: 15px"
                ms_positioning ="FlowLayout" > 优先权 </ DIV >
             < asp:textbox  id ="tbYx"  style ="Z-INDEX: 101; LEFT: 328px; POSITION: absolute; TOP: 120px"  runat ="server" ></ asp:textbox >< asp:button  id ="btSave"  style ="Z-INDEX: 102; LEFT: 336px; POSITION: absolute; TOP: 208px"  runat ="server"
                Text ="添加" ></ asp:button >< asp:dropdownlist  id ="DropDownList1"  style ="Z-INDEX: 103; LEFT: 328px; POSITION: absolute; TOP: 160px"
                runat ="server" >
                 < asp:ListItem  Value ="always"  Selected ="True" > always </ asp:ListItem >
                 < asp:ListItem  Value ="hourly" > hourly </ asp:ListItem >
                 < asp:ListItem  Value ="daily" > daily </ asp:ListItem >
                 < asp:ListItem  Value ="weekly" > weekly </ asp:ListItem >
                 < asp:ListItem  Value ="monthly" > monthly </ asp:ListItem >
                 < asp:ListItem  Value ="yearly" > yearly </ asp:ListItem >
             </ asp:dropdownlist >
             < DIV  style ="DISPLAY: inline; Z-INDEX: 105; LEFT: 208px; WIDTH: 70px; POSITION: absolute; TOP: 80px; HEIGHT: 15px"
                ms_positioning ="FlowLayout" > 网址 </ DIV >
         </ form >
     </ body >
</ HTML >

后台代码

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.IO;
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;
using  System.Xml.Schema;
namespace  TheTestXml.DsSiteAdmin.xml
{
    /**//// <summary>
    /// InsertXML 的摘要说明。
    /// </summary>
    public class InsertXML : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
        protected System.Web.UI.WebControls.Button btSave;
        protected System.Web.UI.WebControls.TextBox tbYx;
        protected System.Web.UI.WebControls.TextBox tbUrl;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
        }

        /**//// <summary>
        /// 插入SITEMAP数据
        /// </summary>
        /// <param name="_webUrl"></param>
        /// <param name="_priority"></param>
        /// <param name="lastTime"></param>
        /// <param name="freq"></param>
        private void AddXML(string _webUrl,string _priority,string lastTime,string freq)
        {

            XmlNamespaceManager   nsmgr;       
            string   path   =   Server.MapPath("~\\sitemap\\sitemap.xml");      
            XmlDocument   xmldoc   =   new   XmlDocument();   
            xmldoc.Load(path);          
            nsmgr   =   new   XmlNamespaceManager(xmldoc.NameTable); 
  
            nsmgr.AddNamespace("tk","http://www.google.com/schemas/sitemap/0.84");    

            XmlNode root=xmldoc.SelectSingleNode("//tk:urlset",nsmgr);

            XmlElement xe1=xmldoc.CreateElement("", "url",xmldoc.DocumentElement.NamespaceURI);//创建一个<url>节点        
            
            XmlElement xesub1=xmldoc.CreateElement("","loc",xmldoc.DocumentElement.NamespaceURI);        
            xesub1.InnerText=_webUrl;//设置文本节点
            xe1.AppendChild(xesub1);//添加到<loc>节点中

            XmlElement xesub2=xmldoc.CreateElement("","priority",xmldoc.DocumentElement.NamespaceURI);
            xesub2.InnerText=_priority;
            xe1.AppendChild(xesub2);

            XmlElement xesub3=xmldoc.CreateElement("","lastmod",xmldoc.DocumentElement.NamespaceURI);
            xesub3.InnerText=lastTime;
            xe1.AppendChild(xesub3);

            XmlElement xesub4=xmldoc.CreateElement("","changefreq",xmldoc.DocumentElement.NamespaceURI);
            xesub4.InnerText=freq;
            xe1.AppendChild(xesub4);

            root.AppendChild(xe1);//添加到<urlset>节点中    

            xmldoc.Save(Server.MapPath("~\\sitemap\\sitemap.xml"));    
        }
        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.btSave.Click += new System.EventHandler(this.btSave_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void btSave_Click(object sender, System.EventArgs e)
        {
            string dTime=string.Format("{0:yyyy-MM-ddThh:mmzzz}",DateTime.Now);
            AddXML(tbUrl.Text.Trim(),tbYx.Text.Trim(),dTime,DropDownList1.SelectedValue);
            
        }
    }
}