using System;
using System.Xml;
using System.Xml.XPath;
class Program {
   static void Main() {
      XPathDocument doc = new XPathDocument(@"C:\books.xml");
      XPathNavigator navigator = doc.CreateNavigator();
      navigator.MoveToRoot();
      DisplayRecursive(navigator, string.Empty);
   }
   static public void DisplayRecursive(XPathNavigator navigator, 
                                       string indent) {
      if ( navigator.HasChildren ) {
         navigator.MoveToFirstChild();
         DisplayNode(navigator,indent+"   ");
         DisplayRecursive(navigator, indent + "   ");
         navigator.MoveToParent();
      }
      while ( navigator.MoveToNext() ) {
         DisplayNode( navigator, indent );
         DisplayRecursive( navigator, indent );
      }
   }
   static private void DisplayNode(XPathNavigator navigator,string indent){
      if (navigator.NodeType == XPathNodeType.Text)
         Console.WriteLine(indent+navigator.Value);
      else if (navigator.Name != String.Empty)
         Console.WriteLine(indent + "<" + navigator.Name + ">");
   }
}