XML LINQ C#

using System;
using System.IO;
using System.Text;
using System.Linq;
using System.Xml.Linq;
using System.Xml;
using System.Collections;
using System.Collections.Generic;
public class MainClass
{
    public static void Main()
    {
        StringBuilder sb = new StringBuilder();
        XmlWriterSettings xws = new XmlWriterSettings();
        xws.OmitXmlDeclaration = true;
        xws.Indent = true;
        using (XmlWriter xw = XmlWriter.Create(sb, xws))
        {
            XDocument doc = new XDocument(
                new XElement("Child",
                    new XElement("GrandChild", "some content")
                )
            );
            doc.WriteTo(xw);
        }
        Console.WriteLine(sb.ToString());
    }
}