XMLDocument doc = new XMLDocument()
doc.LoadXML(@"<?xml version="1.0" encoding="utf-8" ?>
<customerInfo>
<NO1>
<name>testusd</customerAccount>          //你的xml不合法          customerAccount没有开始标记
<age>12</customerName>
<address>testusd</address>
</NO1>
<NO2>
<name>test</customerAccount>
<age>19</customerName>
<address>test</address>
</NO2>
</customerInfo>");
txtName.Text=doc.SelectSingleNode("//NO1/name").InnerText;
txtAge.Text=doc.SelectSingleNode("//NO1/age").InnerText;
txtAddress.Text=doc.SelectSingleNode("//NO1/address").InnerText;

------解决方案--------------------
C# code

XmlDocument   doc=new   XmlDocument();   
  doc.Load(Server.MapPath(ConfigurationSettings.AppSettings["xxx"]));  //Load 
  XmlNode   root=doc.DocumentElement;//根节点   
  XmlNode   opReq=root.SelectSingleNode("xxx");   
  XmlNode   Param=opReq.SelectSingleNode("xxx");   
  string   strName=Param.SelectSingleNode("xxx").value;

------解决方案--------------------
用 XmlDocument

------解决方案--------------------
通用XML读取器 收藏  
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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;  
    
using System.Xml;  
    
using System.Data.SqlClient;  
    
    
    
public partial class Default2 : System.Web.UI.Page  
    
{  
    
   protected void Page_Load(object sender, EventArgs e)  
    
   {  
    
       //声明XmlReader对象,因为从数据读的时候返回的是这个对象,方便两种方式读取