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Accessing the First Child Element with a Specified Name

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 XComment("This is a new author."),         new XProcessingInstruction("AuthorHandler", "new"),         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.Element("FirstName"));     } }