System.IO.BufferedStream.CopyToAsync C# (CSharp) Method

        public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
        {
            StreamHelpers.ValidateCopyToArgs(this, destination, bufferSize);
            return cancellationToken.IsCancellationRequested ?
                Task.FromCanceled<int>(cancellationToken) :
                CopyToAsyncCore(destination, bufferSize, cancellationToken);
        }