Csharp/C Sharp by API/System.Xml.Linq/XProcessingInstruction

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new XProcessingInstruction("AuthorHandler", "new")

<source lang="csharp"> 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"))));
       foreach (XNode node in firstParticipant.Nodes().OfType<XComment>()) {
           Console.WriteLine(node);
       }
   }

}

 </source>