public void UpdateContact(PersonalDetailDto personalDetailDto)
        {
            using (var context = base.CreateDbContext())
            {
                var dbObject = context.PersonalDetails

                    .FirstOrDefault(c=>c.Id == personalDetailDto.Id);

                var detailsFromUpdate = personalDetailDto.ContactNumbers;

                personalDetailDto.ContactNumbers = null;

                _mapper.Map(personalDetailDto, dbObject);

                var contactDetails = context.ContactNumbers.Where(c => c.PersonalDetailId == personalDetailDto.Id);


                // map existing
                foreach (var contactDetail in contactDetails)
                {
                    var updated = detailsFromUpdate.Find(c => c.Id == contactDetail.Id);
                    if (updated != null)
                    {
                        _mapper.Map(updated, contactDetail);
                    }

                    else
                    {
                        context.ContactNumbers.Remove(contactDetail);
                    }
                }

                // add new
                foreach (var contactNumberDto in detailsFromUpdate.Where(c => c.Id == 0))
                {
                    var newItem = _mapper.Map<ContactNumber>(contactNumberDto);
                    newItem.PersonalDetailId = personalDetailDto.Id;
                    context.ContactNumbers.Add(newItem);
                }


                context.SaveChanges();
            }
        }