How to attach CancellationTokenSource to DownloadStringTaskAsync method and cancel the async call?

The async capabilities of WebClient predate . Net 4.5, so it supports the Task-based Asynchronous Pattern only partially. That includes having its own cancellation mechanism: the CancelAsync() method which works even with the new -TaskAsync methods.

To call this method when a CancellationToken is canceled, you can use its Register() method.

WebClient doesn't support cancellation. I recommend you use a newer type such as HttpClient.

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