public static IQueryable<PetShop.Core.Data.Order> ByCourier(this IQueryable<PetShop.Core.Data.Order> queryable, string courier, params string[] additionalValues)
        {
            var courierList = new List<string> { courier };

            if (additionalValues != null)
                courierList.AddRange(additionalValues);

            if (courierList.Count == 1)
                return queryable.ByCourier(courierList[0]);

            return queryable.ByCourier(courierList);
        }
        public static IQueryable<Petshop.Data.Entities.Order> ByCourier(this IQueryable<Petshop.Data.Entities.Order> queryable, System.String courier, params System.String[] additionalValues)
        {
            var courierList = new List<System.String> { courier };

            if (additionalValues != null)
                courierList.AddRange(additionalValues);

            if (courierList.Count == 1)
                return queryable.ByCourier(courierList[0]);

            return queryable.ByCourier(courierList);
        }