private Product InsertProduct(Guid productCode, string description, string supplierCode = "", float price = 0.0f,
                                      float height = 0.0f, float width = 0.0f, float depth = 0.0f, float weight = 0.0f)
        {
            Product p = new Product()
            {
                ProductCode  = productCode,
                Description  = description,
                SupplierCode = supplierCode,
                Price        = price,
                Height       = height,
                Width        = width,
                Depth        = depth,
                Weight       = weight
            };
            Session.Save(p);

            return p;
        }
 private OrderLine CreateOrderLine(Product product, int quantity = 1)
 {
     return new OrderLine()
     {
         Product  = product,
         Quantity = quantity
     };
 }