public void SetProduct()
        {
            var db = new BusinessEntities();

            if (this.Product == null)
            {
                this.Product = db.Products.Find(this.product_id);
            }
            db.Dispose();
        }
        private void SetProductInventory(int productInventoryID)
        {
            var db = new BusinessEntities();

            this.product_inventory_id = productInventoryID;
            this.ProductInventory     = db.Product_Inventory.Find(productInventoryID);
            this.ProductInventory.CalculatePackage();
            this.ProductInventory.SetProduct();
            db.Dispose();
        }