Note: CustomerOrders is derived from DocCommon

 public class DocCommon
    {
        public string Id { get; set; }
        public double Score { get; set; }
    }
     public class CustomerOrders : DocCommon
   {
        public string customerID { get; set; }
        public string customerName { get; set; }
        public string address { get; set; }
        public string city { get; set; }
        public string postalCode { get; set; }
        public string country { get; set; }
        public int orderID { get; set; }
        public System.Nullable<System.DateTime> orderDate { get; set; }
        public System.Nullable<System.DateTime> requiredDate { get; set; }
        public System.Nullable<System.DateTime> shippedDate { get; set; }
        public string shipperName { get; set; }
        public int productID { get; set; }
        public string productName { get; set; }
        public decimal unitPrice { get; set; }
        public short quantity { get; set; }
        public System.Nullable<decimal> extendedPrice { get; set; }
    }