public List <ProductViewModel> ReadProductsByCategory(int categoryID)
        {
            var products = null as List <Product_DTO>;

            using (var proxy = new NorthwindContractClient())
                products = proxy.ReadProductsByCategory(categoryID);

            return(products.ConvertAll(ProductMapper.Map));
        }
        public List <Category_DTO> ReadAllCategories()
        {
            var categories = null as List <Category_DTO>;

            using (var proxy = new NorthwindContractClient())
                categories = proxy.ReadAllCategories();

            return(categories);
        }