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Query:
XmlDocument doc = new XmlDocument();
  
doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
           
//UserÊÇXML¸ù½Úµã,Name×Ö½Úµã
      lbEmail.Text =
doc.SelectSingleNode("//User[Name='"+ddlName.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText;
Delete:
    XmlDocument xmlDoc = new XmlDocument();
  
xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
   XmlNodeList
xnl=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;
 
  
foreach(XmlNode xn in xnl)
   {
    XmlElement xe=(XmlElement)xn;
   
XmlNodeList node = xe.GetElementsByTagName("Name");
   
if(node.Count>0)
    {
     if(node[0].InnerText==ddlName.SelectedItem.Text)
     
xe.RemoveAll();//ɾ³ý¸Ã½ÚµãµÄÈ«²¿ÄÚÈÝ
     break;
    }
   }
  
  
xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
Add:
XmlDocument xmlDoc = new XmlDocument();
  
xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
   XmlNode
root=xmlDoc.SelectSingleNode("dbGuest");//²éÕÒ<dbGuest>
  
XmlElement xe1=xmlDoc.CreateElement("User");//´´½¨Ò»¸ö<User>½Úµã
  
XmlElement xesub1=xmlDoc.CreateElement("Name");
  
xesub1.InnerText="Guset";//ÉèÖÃÎı¾½Úµã
  
xe1.AppendChild(xesub1);//Ìí¼Óµ½<User>½ÚµãÖÐ
   XmlElement
xesub2=xmlDoc.CreateElement("City");
   xesub2.InnerText="ÉϺ£";
  
xe1.AppendChild(xesub2);
   XmlElement
xesub3=xmlDoc.CreateElement("Email");
   xesub3.InnerText="ss@2


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<hutaow:Message version="1.0" xmlns:hutaow="http://wangtao.cublog.cn">
<hutaow:Head>
<hutaow:Date>20080502</hutaow:Date>
<hutaow:Source>
......

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