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XObject Event Handling Using Lambda Expressions

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 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("{0}{1}", xDocument, System.Environment.NewLine);         firstParticipant.Changing += new EventHandler<XObjectChangeEventArgs>(           (object sender, XObjectChangeEventArgs cea) =>             Console.WriteLine("Type of object changing: {0}, Type of change: {1}",               sender.GetType().Name, cea.ObjectChange));         firstParticipant.Changed += (object sender, XObjectChangeEventArgs cea) =>           Console.WriteLine("Type of object changed: {0}, Type of change: {1}",             sender.GetType().Name, cea.ObjectChange);         xDocument.Changed += (object sender, XObjectChangeEventArgs cea) =>           Console.WriteLine("Doc: Type of object changed: {0}, Type of change: {1}{2}",             sender.GetType().Name, cea.ObjectChange, System.Environment.NewLine);         firstParticipant.Element("FirstName").Value = "Seph";         Console.WriteLine("{0}{1}", xDocument, System.Environment.NewLine);     } }