BAL.Manager.PersonManager.GetPersonByUserId C# (CSharp) Method

        public PersonDTO GetPersonByUserId(int? id)
        {
            if (id == 0)
             {
                 return null;
             }
             var person = uOW.PersonRepo.Get().Where(s => s.UserId == id).FirstOrDefault();
             if (person != null)
             {
                 return Mapper.Map<PersonDTO>(person);
             }
             return null;
        }