using System;
using System.Xml;
using System.Xml.XPath;
class Program {
   static void Main() {
      XmlDocument xDoc = new XmlDocument();
      try { xDoc.Load(@"C:\books.xml"); } catch { }
      XPathNavigator navigator = xDoc.CreateNavigator();
      navigator.MoveToRoot();              // Select the root.
      if (navigator.MoveToFirstChild())    // Select <bookstore>.
         if (navigator.MoveToFirstChild()) // Select 
                                           // <book>Autobiography...
            navigator.InsertElementBefore( string.Empty, "book", 
                               string.Empty, "Pratical .NET and C#");
      xDoc.Save(@"C:\new_books.xml");
   }
}