The CancelAsync method in C# is a member of the System.Net.WebClient class. It is used to cancel an asynchronous operation that was started by calling any of the asynchronous methods such as DownloadFileAsync or UploadFileAsync. This method allows developers to stop the ongoing operation before it completes, which can be useful in scenarios where the user wants to interrupt a time-consuming or unnecessary download/upload process. By calling CancelAsync, any pending or ongoing operation is halted, and the WebClient instance is prepared for a new operation to be initiated.
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