Let me first define the Person Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace zSharp2010.Serializer
{
    [Serializable()]
    public class Person
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public DateTime DOB { get; set; }
        public string City { get; set; }
    }
}

The serialization class has two functions, Serializer and DeSerializer.
We pass the xml file name and a list of person class to Serialize function to be serialized.
The deserialized function returns a list of persons, we provide the xml file name.

class cSerializer
{
 public void Serialize(string file, List<Person> persons)
 {
  XmlSerializer xmlSerializer = new XmlSerializer(persons.GetType());
  StreamWriter writer = new StreamWriter(file);
  xmlSerializer.Serialize(writer, persons);
  writer.Close();
 }

 public List<Person> DeSerialize(string file)
 {
  List<Person> persons = new List<Person>();
  Person person = new Person();
  XmlSerializer xmlSerializer = new XmlSerializer(typeof (List<Person>));
  StreamReader reader = new StreamReader (file);
  persons = (List<Person>) xmlSerializer.Deserialize (reader);
  return persons;
 }
}

The calling methods might look like this:
public partial class fSerializer : Form
{
 string file = @"C:\temp\Serializer.xml";
 public fSerializer()
 {
  InitializeComponent();
 }

 private void cmdSerialize_Click(object sender, EventArgs e)
 {
  cSerializer serializer = new cSerializer();
  List<Person> persons = GetPersons();
  serializer.Serialize(file, persons);
 }

 private void cmdDeSerialize_Click(object sender, EventArgs e)
 {
  cSerializer serializer = new cSerializer();
  List<Person> persons = serializer.DeSerialize(file);
  string msg = String.Empty;
  foreach (Person person in persons)
   msg += String.Format("ID : {0}, Name : {1}, DOB : {2}, City : {3}\r\n", person.ID, person.Name, person.DOB, person.City);
  MessageBox.Show( msg);
 }

 private List<Person> GetPersons()
 {
  Person person = new Person();
  List<Person> persons = new List<Person>();
  person.ID = 1;
  person.Name = "George";
  person.DOB = Convert.ToDateTime("01-01-2001");
  person.City = "Mt. Vernon";
  persons.Add(person);
  person = new Person();
  person.ID = 2;
  person.Name = "John";
  person.DOB = Convert.ToDateTime("01-01-2002");
  person.City = "Quincy";
  persons.Add(person);
  person = new Person();
  person.ID = 3;
  person.Name = "Thomas";
  person.DOB = Convert.ToDateTime("01-01-2001");
  person.City = "Montecello";
  persons.Add(person);
  return persons;
 }
}