using System;

using System.IO;

using System.Collections;

using System.Collections.Generic;

using System.Xml.Serialization;

​

public class Program

{

    public static void Main()

    {

        var _class = new MyClass

        {

            Name = "Root",

            Nodes = new List<MyClass>(new[]

                                      {

                                          new MyClass{ Name = "FirstChild" },

                                          new MyClass{ Name = "SecondChild",

                                                      Nodes = new List<MyClass>(new[]{new MyClass{Name = "LastChild"}})

                                                     }

                                      })

        };

        var serializer = new XmlSerializer(typeof(MyClass));

        using (var ms = new MemoryStream())

        {

            var sw = new StreamWriter(ms);

            serializer.Serialize(sw, _class);

            sw.Flush();

​

            ms.Position = 0;

            var sr = new StreamReader(ms);

            var myStr = sr.ReadToEnd();

            Console.WriteLine(myStr);

        }

    }

    public class MyClass

    {

        public string Name {get;set;}

        public List<MyClass> Nodes {get;set;}

    }

}