async in C#

Async.cs

// synchronous way
private void Synchronous()
{
    WebClient proxy = new WebClient();
    string result = proxy.DownloadString("http://tel.search.ch/?wo=luzern");
}

// with backgroundworkers
private void Background()
{
    this.ClearText();

    BackgroundWorker worker = new BackgroundWorker();
    worker.DoWork += new DoWorkEventHandler(worker_DoWork);
    worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    try
    {
        worker.RunWorkerAsync();
    }
    catch (Exception ex)
    {
        // ...
    }
}

private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    if (e.Error != null)
    {
        // ...
    }

    this.txtWebResult.Text = e.Result.ToString();
}

private void worker_DoWork(object sender, DoWorkEventArgs e)
{
    WebClient proxy = new WebClient();
    string result = string.Empty;
    try
    {
        result = proxy.DownloadString("http://tel.search.ch/?wo=luzern");
    }
    catch (Exception ex)
    {
        // ...
    }
    e.Result = result;
}

// with async
private async void Async()
{
    this.ClearText();

    WebClient proxy = new WebClient();
    string result = string.Empty;
    try
    {
        result = await proxy.DownloadStringTaskAsync("http://tel.search.ch/?wo=luzern");
    }
    catch (Exception ex)
    {
        // ...
    }
    this.txtWebResult.Text = result;
}