using System;
using System.Linq;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass{
public static void Main(){
XElement root = new XElement("Root",
new XElement("Child", "child content")
);
// ReplaceAll with an XElement object.
root.ReplaceAll(new XElement("NewChild", "n"));
Console.WriteLine(root);
}
}