使用XmlDocument 读取books.xml中的书名到DropDownList中

XmlDocument xdoc; 
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                xdoc = new XmlDocument();//声明一个xml文档，xdoc代表一个xml文档
                xdoc.Load(Server.MapPath("books.xml"));//把xml文档复制一份给xdoc
                XmlNodeList list = xdoc.GetElementsByTagName("name");
                foreach (XmlNode node in list)
                {
                    this.DropDownList1.Items.Add(node.InnerText);
                }
                Session["doc"] = xdoc;
            }
            else
            {
                xdoc = Session["doc"] as XmlDocument;
            }
        }