Moving folder from one place to another using MultiThread

BackgroundWorker bw;
private void button1_Click(object sender, EventArgs e)
    {
    Button b = sender as Button;
    if (b != null && b.Text == "Start")
        {
        bw = new BackgroundWorker();
        bw.WorkerSupportsCancellation = true;
        bw.DoWork += new DoWorkEventHandler(bw_DoWork);
        bw.RunWorkerAsync();
        b.Text = "Stop";
        }
    else
        {
        if (bw.IsBusy)
            {
            bw.CancelAsync();
            }
        b.Text = "Start";
        }
    }
void bw_DoWork(object sender, DoWorkEventArgs e)
    {
    BackgroundWorker worker = sender as BackgroundWorker;
    int i = 0;
    while (true)
        {
        if (worker.CancellationPending == true)
            {
            e.Cancel = true;
            break;
            }
        else
            {
            Console.WriteLine(i++);
            System.Threading.Thread.Sleep(500);
            }
        }
    }