Saving Data Structures in C#

using System;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Linq;
public class XElementContainer
{
    public XElement member;
    public XElementContainer()
    {
        member = XLinqTest.CreateXElement();
    }
    public override string ToString()
    {
        return member.ToString();
    }
}
public class XElementNullContainer
{
    public XElement member;
    public XElementNullContainer()
    {
    }
}
class XLinqTest
{
    static void Main(string[] args)
    {
        Test<XElementNullContainer>(new XElementNullContainer());
        Test<XElement>(CreateXElement());
        Test<XElementContainer>(new XElementContainer());
    }
    public static XElement CreateXElement()
    {
        XNamespace ns = "http://www.adventure-works.com";
        return new XElement(ns + "aw");
    }
    static void Test<T>(T obj)
    {
        using (MemoryStream stream = new MemoryStream())
        {
            XmlSerializer s = new XmlSerializer(typeof(T));
            Console.WriteLine("Testing for type: {0}", typeof(T));
            s.Serialize(XmlWriter.Create(stream), obj);
            stream.Flush();
            stream.Seek(0, SeekOrigin.Begin);
            object o = s.Deserialize(XmlReader.Create(stream));
            Console.WriteLine("  Deserialized type: {0}", o.GetType());
        }
    }
}