public class AccViewModel: ViewModel
    {
        public Referti Referti { get; set; }

        public Referto _selectedReferto = null;


        //private BackgroundWorker bw = new BackgroundWorker();

        //public BackgroundWorker BackGroundWorker
        //{
        //    get { return bw; }
        //    set { bw = value; }
        //}

        public Referto SelectedReferto
        {
            get { return _selectedReferto; }
            set
            {
                _selectedReferto = value;
                NotifyPropertyChanged("SelectedReferto");
            }
        }

        private static System.Windows.Threading.Dispatcher _dispatcher = null;
        public static System.Windows.Threading.Dispatcher Dispatchet
        {
            get { return _dispatcher; } 
            set { _dispatcher = value; }
        }


        private delegate void Datadelegate();
        System.Threading.Thread tx;
        public delegate void updateData();
        updateData d;


        public AccViewModel()
        {
            //Codice per il BAckGroundWorker
            //bw.WorkerReportsProgress = true;
            //bw.WorkerSupportsCancellation = true;
            //bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            //bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
            //bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

            Referti = new Referti();
            SelectedReferto = null;
             //Semplice
            //RetrieveData();

             //Thread
            //ThreadStart start = () => Dispatchet.BeginInvoke(DispatcherPriority.Normal,
            //                                                    new Action(RetrieveData));
            //new Thread(start).Start();

             //altro sistema
            d = new updateData(RetrieveData);
            tx = new System.Threading.Thread(RetrieveDataThread);
            tx.Start();

            //bw.RunWorkerAsync();
            //Action a =
            //    () => RetrieveData();
            //Dispatchet.BeginInvoke(a,new object[]{});
            //RetrieveData();
        }

        //private void bw_DoWork(object sender, DoWorkEventArgs e)
        //{
        //    BackgroundWorker worker = sender as BackgroundWorker;
        //    System.Windows.Threading.Dispatcher dispatcher = System.Windows.Threading.Dispatcher.CurrentDispatcher;
        //    Action a =
        //        () => RetrieveData();
        //    Dispatchet.BeginInvoke(a, new object[] { });

            
        //}


        //private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        //{
        //    if ((e.Cancelled == true))
        //    {
        //        ;
        //    }

        //    else if (!(e.Error == null))
        //    {
        //        ;
        //    }

        //    else
        //    {
        //        ;
        //    }
        //}

        //private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        //{
            
        //}

        private static bool _received = false;
        public static bool Received
        {
            get { return _received; }
        }

        private void RetrieveDataThread()
        {
            Dispatchet.BeginInvoke(d, null);
        }

        private void RetrieveData()
        {
            if (_received)
            {
                _received = !_received;
                return;
            }
            _received = !_received;

            try
            {
                //System.Threading.Thread.Sleep(5000);
                Referti = Referti.GetReferti(Configuration.DataFolder, Referti);
                base.NotifyPropertyChanged("Referti");
            } catch (Exception ex)
            {
                ;
            }
        }
    }