public class Product
    {
          public int ProductId { get; set; }

          public string ProductName { get; set; }

          public decimal ListPrice { get; set; }

          public string ProductNumber { get; set; }

          public DateTime SellStartDate { get; set; }
    }

    public class ProductSubcategory
    {
        public int ProductSubcategoryId { get; set; }

        public string ProductSubcategoryName { get; set; }

        public IList<Product> Products { get; set; }
    }