public FrmPlanningActiviteVacancier()
        {
            InitializeComponent();
            foreach (Activite uneActivite in Donnees.GetLesActivitesInscripVacancier())
            {
                uneActivite.DateAct = uneActivite.DateAct;                         //affiche la date au bon format (vire le hh:mm:ss)
                DayOfWeek dow = Convert.ToDateTime(uneActivite.DateAct).DayOfWeek; //récupere la date du jours sous forme de string

                switch (dow)
                {
                case DayOfWeek.Monday:
                    listBLundi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Tuesday:
                    listBMardi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Wednesday:
                    listBMercredi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Thursday:
                    listBJeudi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Friday:
                    listBVendredi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Saturday:
                    listBSamedi.Items.Add(uneActivite);
                    break;

                case DayOfWeek.Sunday:
                    listBDimanche.Items.Add(uneActivite);
                    break;
                }
            }
        }