c#中如何使用XML？

Question

  public void ZzqWriteXML(string strXMLFile)
        {
                      XmlDocument xmlDoc=new XmlDocument();
           xmlDoc.Load("bookstore.xml");
           XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
           XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点
           xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
           xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性
         
           XmlElement xesub1=xmlDoc.CreateElement("title");
           xesub1.InnerText="CS从入门到精通";//设置文本节点
           xe1.AppendChild(xesub1);//添加到<book>节点中
           XmlElement xesub2=xmlDoc.CreateElement("author");
           xesub2.InnerText="候捷";
           xe1.AppendChild(xesub2);
           XmlElement xesub3=xmlDoc.CreateElement("price");
           xesub3.InnerText="58.3";
           xe1.AppendChild(xesub3);
         
           root.AppendChild(xe1);//添加到<bookstore>节点中
           xmlDoc.Save("bookstore.xml");
        }