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Traversing Backward from an XElement Object via the PreviousNode Property

using System; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Xml; using System.Xml.Linq; public class MainClass {     public static void Main() {         XElement firstParticipant;         XDocument xDocument = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"),          new XDocumentType("Books", null, "Books.dtd", null),          new XProcessingInstruction("Book", "out-of-print"),          new XElement("Books", firstParticipant =           new XElement("Book",          new XAttribute("type", "Author"),          new XElement("FirstName", "J"),          new XElement("LastName", "R")),          new XElement("Book",          new XAttribute("type", "Author"),          new XElement("FirstName", "E"),          new XElement("LastName", "B"))));         Console.WriteLine(firstParticipant.NextNode.PreviousNode);     } }