public EtudiantListViewModel()
        {
            EntityModelConnexion context = new EntityModelConnexion();

            _etudiants = new ObservableCollection <tbEtudiants>(context.tbEtudiants);

            //foreach (tbEtudiants etudiant in context.tbEtudiants.ToList<tbEtudiants>())
            //    _etudiants.Add(etudiant);
        }
        public EtudiantListViewModel()
        {
            EntityModelConnexion context = new EntityModelConnexion();

            _etudiants = new ObservableCollection <tbEtudiant>(context.tbEtudiants);


            // _etudiants = new ObservableCollection<Etudiant>();
            // _etudiants.Add(new Etudiant("Holmes", "Sherlock", "Baker Street", "121b", "1000", "London"));
            // _etudiants.Add(new Etudiant("Newton", "Isaac", "Gravity Street", "12345", "1045", "Bagdad"));
        }