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

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

            if (billCityList.Count == 1)
                return queryable.ByBillCity(billCityList[0]);

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

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

            if (billCityList.Count == 1)
                return queryable.ByBillCity(billCityList[0]);

            return queryable.ByBillCity(billCityList);
        }