public SI_MailingSelectionViewModel()
        {
            db = new SteinbachEntities();

            ListboxSelectedEventsVM                = new ListboxSelectedEventsViewModel(null, db);
            ListboxSelectedKategorienVM            = new ListboxSelectedKategorienViewModel(db);
            ListboxSelectedTypFirmaEigenschaftenVM = new ListboxSelectedTypFirmaEigenschaftenViewModel(db);


            tiTimer          = new DispatcherTimer();
            tiTimer.Tick    += tiTimer_Tick;
            tiTimer.Interval = new TimeSpan(0, 0, 0, 0, 500);
            tiTimer.Start();
            selectionType  = SelectionType.None;
            SelectedAction = "Keine Aktion gewählt";
            AttachedFiles  = new ObservableCollection <string>();
            SetisExecutEnabled();

            int mailMethod = CommonTools.Tools.ConfigEntry <int> .GetConfigEntry("MailMethod", "1", "1 = Exchangeserver, 0=Outlook Client");

            rbExchange = mailMethod == 1 ? true : false;
            rbOutlook  = !rbExchange;


            db.ExecuteStoreCommand("delete from SI_SelectedEvents");
            db.ExecuteStoreCommand("delete from SI_SelectedKategorien");
            db.ExecuteStoreCommand("delete from SI_SelectedTypFirmaEigenschaften");
        }