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1 bookstore.xml
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
  <book genre="love" ISBN="1234123">
    <title>who am i </title>
    <author>who</author>
    <price>999</price>
  </book>
</bookstore>
2 bookstore.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
namespace toxml
{
    public class ToXml
    {
        public static void Main(string[] args)
        {
            //ʵÀý»¯Ò»¸öXmlDocument¶ÔÏó
            XmlDocument xmlDoc = new XmlDocument();
            //ʵÀý¶ÔÏó¶ÁȡҪдÈëµÄXMLÎļþ
            xmlDoc.Load("bookstore.xml");
            //²éÕÒ<bookstore>
            XmlNode root = xmlDoc.SelectSingleNode("bookstore");
            //´´½¨Ò»¸ö<book>½Úµã
            XmlElement xe1 = xmlDoc.CreateElement("book");
            //ÉèÖøýڵãgenreÊôÐÔ
            xe1.SetAttribute("leixing", "music");
            //ÉèÖøýڵãISBNÊôÐÔ   
            xe1.SetAttribute("ISBN", "56756");