public string DeleteAllEntities()
        {
            StringBuilder result = new StringBuilder();

            result.AppendFormat("Deleted {0} categories\r\n", categoryRepository.DeleteAll());
            result.AppendFormat("Deleted {0} contractors\r\n", contractorRepository.DeleteAll());
            result.AppendFormat("Deleted {0} contracts\r\n", contractRepository.DeleteAll());
            result.AppendFormat("Deleted {0} images\r\n", imageRepository.DeleteAll());
            result.AppendFormat("Deleted {0} products\r\n", inventoryRepository.DeleteAll());
            result.AppendFormat("Deleted {0} order items\r\n", orderItemRepository.DeleteAll());
            result.AppendFormat("Deleted {0} orders\r\n", orderRepository.DeleteAll());
            result.AppendFormat("Deleted {0} shopping cart items\r\n", shoppingCartItemRepository.DeleteAll());
            result.AppendFormat("Deleted {0} shopping carts\r\n", shoppingCartRepository.DeleteAll());
            return(result.ToString());
        }