XML (de)serialization

xmlstuff.cs

class Program
{
    static void Main(string[] args)
    {
        // serialize
        using (var stream = new FileStream(".\\test.xml", FileMode.Create))
            new XmlSerializer(typeof(Customer)).Serialize(
                stream, 
                new Customer() { 
                    Name = "PDMLab", 
                    Id = 1, 
                    Orders = new List<Order>() { 
                        new Order() { 
                            Id = 1, 
                            Item = "MacBook Pro Retina" 
                            
                        } 
                    } 
                });
        
        Console.ReadLine();
        
        // deserialize
        using (var fileStream = new FileStream(".\\test.xml", FileMode.Open))
            new XmlSerializer(typeof(Customer)).Deserialize(fileStream);
    }
}

[Serializable]
public class Customer
{
    public Customer()
    {
        Orders = new List<Order>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public List<Order> Orders { get; set; }
}

[Serializable]
public class Order
{
    public int Id { get; set; }
    public string Item { get; set; }
}