public void Modificar(PeriodViewModel pPeriodViewModel)
{
periods operiods = oRepositorio.FindById(pPeriodViewModel.period_id);
operiods.name = pPeriodViewModel.name;
operiods.user_id_modified = pPeriodViewModel.user_id_modified;
operiods.start_date = pPeriodViewModel.start_date;
operiods.end_date = pPeriodViewModel.end_date;
operiods.date_modified = DateTime.Now;
oRepositorio.Update(operiods);
oUnitOfWork.SaveChanges();
}