xml节点信息

xml： 
<?xml version="1.0" encoding="utf-8" ?>
<library>
 <name>首都图书馆</name>
 <address>朝阳区华威桥南</address>
 <books>
  <book type="math">
   <id>0000</id>
  </book>
  <book type="computer">
   <id>0001</id>
   <name>Xml初学</name>
   <publisher>人民出版社</publisher>
   <publishdate>2010-05-0-18</publishdate>
   <fee>100.54</fee>
  </book>
  <book type="computer">
   <id>0002</id>
   <name>XSD定义</name>
   <author>子弟</author>
   <publisher>子弟出版社</publisher>
   <publishdate>2010-05-0-18</publishdate>
   <fee>102.54</fee>
  </book>
 </books>
</library>
cs:
            XmlDocument doc=new XmlDocument();
            doc.Load(System.AppDomain.CurrentDomain.BaseDirectory+"/htmlxml/books.xml");
            XmlNodeList nodelist = doc.GetElementsByTagName("book");
            XmlElement element = doc.GetElementById("b3");
            XmlNode node = doc.SelectSingleNode("library/books/book[2]");
            XmlNodeList nodelistselect = doc.SelectNodes("library/books/book");
            Response.Write("Name: " + node.Name + "<br/>");
   &n