using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Xml.Serialization;

namespace XmlSerializerTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            FirstLevel fl = new FirstLevel();
            fl.UserType = "Administrator";
            fl.Credentials = new SecondLevel()
            {
                Username = "FiftyToo",
                Password = "youwish"
            };
            XmlSerializer xml = new XmlSerializer(typeof(FirstLevel));
            using (System.IO.MemoryStream stream = new System.IO.MemoryStream())
            {
                xml.Serialize(stream, fl);
                textBox1.Text = System.Text.ASCIIEncoding.UTF8.GetString(stream.ToArray());
            }
        }
    }





}











using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Xml.Serialization;

namespace XmlSerializerTest
{
    [Serializable]
    public class FirstLevel
    {
        public string UserType { get; set; }
        public SecondLevel Credentials { get; set; }
    }

    [Serializable]
    public class SecondLevel
    {
        public string Username { get; set; }
        public string Password { get; set; }
    }

}