ProcessBar加载条（滚动）

    public Form1()
    {
        InitializeComponent();
        backgroundWorker1.DoWork += BackgroundWorker1_DoWork;
        backgroundWorker1.RunWorkerCompleted += BackgroundWorker1_RunWorkerCompleted;
    }

    private void btStart_Click(object sender, EventArgs e)
    {
        // start the animation
        progressBar1.Visible = true;
        progressBar1.Style = ProgressBarStyle.Marquee;
        progressBar1.MarqueeAnimationSpeed = 20;

        // start the job
        backgroundWorker1.RunWorkerAsync();
    }

    private void BackgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        PerformSomething();
    }

    private void BackgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        progressBar1.Visible = false;
    }

    private void PerformSomething()
    {
        // some work takes 5 sec
        Thread.Sleep(5000);
    }