I have one webservice:

      public class Product

      {
    public int ProductId { get; set; }
    public string ProductName { get; set; }

      }



    public class Service : System.Web.Services.WebService
{
    public Service () {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }


    [WebMethod]

    public List<Product> GetItems()
    {


        List<Product> productList = new List<Product>()
    {
       new Product{ProductId=1,ProductName="Pencil"},
       new Product{ProductId=2,ProductName="Pen"}


    };
        return productList;


    }

and in a asp.net application I am consuming it like:

     localhost.Service s = new localhost.Service();
    List<localhost.Product> k = new List<localhost.Product>();
    k = s.GetItems().ToList();  // i am getting the values here.

now my question is do I need to serialize my webmethod as i am returning custom types? when should we serialize ? is it necessary at all, if yes , then what are the conditions?