public Transaction_effectuee ajouter(Transaction_effectuee u)
        {
            if (u == null)
            {
                u = new Transaction_effectuee();
            }
            try
            {
                db.creerTransaction_effectuee(u.libelle, u.montant_transaction, u.codeCOMPTE_MARKETER, u.codeU);
            }
            catch (Exception ex)
            {
                u.libelle = ex.StackTrace;
            }

            return(u);
        }