find whiskey for region.cs

        public IList<WhiskeyDTO> FindWhiskeyForRegion(Guid regionId)
        {
            using (IUnitOfWork uow = _factory.Create("WhiskeyService.FindWhiskeyForRegion"))
            {
                Region r = uow.RegionRepository.FindById(regionId);
                IList<WhiskeyDTO> result = new List<WhiskeyDTO>();

                if (r == null)
                {
                    throw new ArgumentException(string.Format("Cannot find whiskey for Region {0} as it does not exist.", regionId), "regionId");
                }

                foreach (Distillery d in r.Distilleries)
                {
                    foreach (Whiskey w in d.Whiskeys)
                    {
                        result.Add(WhiskeyDTO.Create(w));
                    }
                }

                return result;
            }
        }