public async Task <Object> GetUnpaid(string eleveids)
{
List <UnpaidViewModel> payementenrollements = await _payementRepository.GetUnpaid(eleveids);
return(payementenrollements.Where(pe => pe.EnrollementPaid != "True").GroupBy(pe => new { pe.EleveId, pe.Prenom, pe.Nom }).Select(pe => new { eleve = pe.Key.Nom + ' ' + pe.Key.Prenom, payementenrollements = pe.ToList().GroupBy(pc => pc.EnrollementId).Select(pc => pc.ToList()) }));
}