private BackgroundWorker _backgroundWorkerB1;

public winMain()
        {
            InitializeComponent();

            //BACKGROUNDWORKER BACKUP 1
            _backgroundWorkerB1 = new BackgroundWorker();

            _backgroundWorkerB1.WorkerReportsProgress = true;
            _backgroundWorkerB1.WorkerSupportsCancellation = true;

            // CREAZIONE HANDLER BACKGORUNDWORK
            _backgroundWorkerB1.DoWork
                += new DoWorkEventHandler(_backgroundWorkerB1_DoWork);
            _backgroundWorkerB1.RunWorkerCompleted
                += new RunWorkerCompletedEventHandler(_backgroundWorkerB1_RunWorkerCompleted);
            _backgroundWorkerB1.ProgressChanged
                += new ProgressChangedEventHandler(_backgroundWorkerB1_ProgressChanged);
        }

        private void _backgroundWorkerB1_DoWork(object sender, DoWorkEventArgs e)
        {
                // Settaggio nome dell'archivio da creare
                ArchivioB1.FileName = dest1 + "\\" + nome1 + ".zip";
                // Crea il nuovo archivio
                ArchivioB1.OpenArchive(System.IO.FileMode.Create);

                ArchivioB1.OnOverallProgress += new BaseArchiver.OnOverallProgressDelegate(ArchivioB1_OnOverallProgress);

                // Setta la directory dell'origine
                ArchivioB1.BaseDir = org1;
                // Copia tutti i file nell'archivio creato
                ArchivioB1.AddFiles("*.*");
                // Chiusura archivio
                ArchivioB1.CloseArchive();
        }

        private void _backgroundWorkerB1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            pbBN1.Value = e.ProgressPercentage;
        }

        private void _backgroundWorkerB1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
                //Una Cancellazione
                lbBN1Stato.Content = "Annullato..";
            }
            else if (e.Error != null)
            {
                //Un Errore
                lbBN1Stato.Content = "Errore..";
            }
            else
            {
                //Completato
                lbBN1Stato.Content = "Completato..";
            }

            _backgroundWorkerB1.Dispose();

            MessageBox.Show("Backup Completati!", "Informazione..", MessageBoxButton.OK, MessageBoxImage.Information);
        }

private void ArchivioB1_OnOverallProgress(object sender, double progress, TimeSpan timeElapsed, TimeSpan timeLeft, ProcessOperation operation, ProgressPhase progressPhase, ref bool cancel)
        {
            _backgroundWorkerB1.ReportProgress(Convert.ToInt32(progress));
        }