public Klasseviewmodel()
        {
            // her laves alle de nye instanser
            Listen              = new Model.Klasseliste();
            AddElevCommand      = new AddElevCommand(addnyelev);
            SletElevCommand     = new SletElevCommand(SletElev);
            Nyelev              = new Model.klasseinfo();
            GemElevCommand      = new GemElevCommand(GemDataTilDiskAsync);
            HentDataCommand     = new HentDataCommand(HentDataFraDiskAsync);
            RydlisteDataCommand = new RydlisteDataCommand(RydlisteData);


            localfolder = ApplicationData.Current.LocalFolder;
            //addnyelevcommand = new RelayCommand(addnyelev);
        }
 public Klasseviewmodel()
 {
     Listen           = new Model.Klasseliste();
     SelectedElev     = new Model.klasseinfo();
     addnyelevcommand = new RelayCommand(addnyelev);
 }