XDeclaration

using System;//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() {

        XDocument xDocument = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"),
                new XElement("BookParticipant"));

        Console.WriteLine(xDocument);
    }
}