public static IQueryable<PetShop.Core.Data.Supplier> ByZip(this IQueryable<PetShop.Core.Data.Supplier> queryable, string zip, params string[] additionalValues)
        {
            var zipList = new List<string> { zip };

            if (additionalValues != null)
                zipList.AddRange(additionalValues);
            else
                zipList.Add(null);

            if (zipList.Count == 1)
                return queryable.ByZip(zipList[0]);

            return queryable.ByZip(zipList);
        }
        public static IQueryable<Petshop.Data.Entities.Account> ByZip(this IQueryable<Petshop.Data.Entities.Account> queryable, System.String zip, params System.String[] additionalValues)
        {
            var zipList = new List<System.String> { zip };

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

            if (zipList.Count == 1)
                return queryable.ByZip(zipList[0]);

            return queryable.ByZip(zipList);
        }