public void Delete(Domain.MCity city)
 {
     _cityRepository.DbContext.BeginTransaction();
     _cityRepository.Delete(city);
     _cityRepository.DbContext.CommitTransaction();
 }
 public void Insert(Domain.MCity city)
 {
     _cityRepository.DbContext.BeginTransaction();
     _cityRepository.Save(city);
     _cityRepository.DbContext.CommitTransaction();
 }