XComment

using System;//from j  av a  2s. c  om
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 myXML = new XElement("Book"); 
        XComment xComment = new XComment("This person is retired.");
        myXML.Add(xComment);

        Console.WriteLine(myXML);

    }
}

using System;//j av a  2  s .  c  o m
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.IO;


public class MainClass{

   public static void Main(string[] args){   
      XDocument NewDoc = new XDocument(
            new XDeclaration("1.0", "utf-8", "yes"),
            new XElement("Root", "MyDoc"));  
      // Add a comment.
      NewDoc.AddFirst(new XComment("This is a comment."));

      // Add another comment.
      NewDoc.Element("Root").Add(new XComment("This is another comment."));

      // Add a third comment.
      NewDoc.Add(new XComment("This is the third comment."));

      // Add some text.
      NewDoc.Element("Root").Add(new XText("This is some text."));
   }
}