public static Category Beverages() {
          return Beverages(DomainModelEntityManager.DefaultManager);
      }

      public static Category Beverages(EntityManager em) {
          return GetCategoryByName(em, "Beverages");
      }

      public static Category Condiments() {
          return Condiments(DomainModelEntityManager.DefaultManager);
      }

      public static Category Condiments(EntityManager em) {
          return GetCategoryByName(em, "Condiments");
      }

      public static Category Produce() {
          return Produce(DomainModelEntityManager.DefaultManager);
      }

      public static Category Produce(EntityManager em) {
          return GetCategoryByName(em, "Produce");
      }

      private static Category GetCategoryByName(EntityManager em, string categoryName) {
          var query = new EntityQuery<Category>("Categories", em);
          return query.Where(c => c.CategoryName == categoryName).FirstOrNullEntity();
      }