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```csharpprivate async void Button_Click(object sender, EventArgs e){    Button.Enabled = false;    Label.Text = "Processing...";    await Task.Run(() => LongRunningTask());    Label.Text = "Done!";    Button.Enabled = true;}private void LongRunningTask(){    Thread.Sleep(5000);}```

```csharpprivate BackgroundWorker worker;public MainForm(){    InitializeComponent();    worker = new BackgroundWorker();    worker.DoWork += Worker_DoWork;    worker.RunWorkerCompleted += Worker_RunWorkerCompleted;}private void Button_Click(object sender, EventArgs e){    Button.Enabled = false;    Label.Text = "Processing...";    worker.RunWorkerAsync();}private void Worker_DoWork(object sender, DoWorkEventArgs e){    Thread.Sleep(5000);}private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e){    Label.Text = "Done!";    Button.Enabled = true;}```

```csharppublic async IAsyncEnumerable<int> GenerateDataAsync(){    for (int i = 0; i < 10; i++)    {        await Task.Delay(100);        yield return i;    }}// 使用方式await foreach (var item in GenerateDataAsync()){    Console.WriteLine(item);}```