c# – 在订阅的异步事件被引发后,是否会自动处理对象？

我的问题……这样做安全吗？调用事件后是否发布了WebClient对象？如果它不会被自动释放,我不想继续分配内存.

我的应用程序适用于带Silverlight的WP7.

谢谢！

void DownloadData(string cURL)
{
    WebClient webClient = new WebClient();
    webClient.DownloadStringCompleted +=
       new System.Net.DownloadStringCompletedEventHandler(
            webClient_DownloadStringCompleted);
    webClient.DownloadStringAsync(new Uri(cURL));
}

static void webClient_DownloadStringCompleted(object sender,System.Net.DownloadStringCompletedEventArgs e)
{
    ...
}