使用Async下载多个文件

我有这段代码，可以很好地下载一个文件。

我如何添加多个文件下载此代码?

 private void Form1_Load(object sender, EventArgs e)
 {
     WebClient client = new WebClient();
     client.DownloadProgressChanged += Client_DownloadProgressChanged;
     client.DownloadFileCompleted += Client_DownloadFileCompleted;
     client.DownloadFileAsync(new Uri("http://download.thinkbroadband.com/10MB.zip"), @"c:'folder'10MB.zip");
 }
 private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
 {
     MessageBox.Show("completed");
 }
 private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
 {
     progressBar1.Maximum = (int)e.TotalBytesToReceive / 100;
     progressBar1.Value = (int)e.BytesReceived / 100;
 }