XDocument.Declaration gets or sets the XML declaration for this document.
using System; using System.Linq; using System.Xml.Linq; using System.Collections; using System.Collections.Generic;
public class MainClass{ public static void Main(){
XDocument doc = new XDocument( new XDeclaration("1.0", "utf-8", "yes"), new XComment("This is a comment"), new XElement("Root", "content")
);