public async Task WaitForCompletion()
            {
                var polling = pollingStrategy.Start();

                while (true)
                {
                    var status = await checkStatusAsync(TaskId).ConfigureAwait(false);

                    if (status.EnsureSuccess().IsCompleted)
                    {
                        return;
                    }

                    await polling.WaitForNextAttempt().ConfigureAwait(false);
                }
            }
            public override async Task <LongOperationResult <TResult, TFailure> > WaitForSuccessOrFailure()
            {
                var polling = pollingStrategy.Start();

                while (true)
                {
                    var taskResult = await checkStatusAsync(TaskId).ConfigureAwait(false);

                    var longOperationResult = ToLongOperationResult(taskResult);
                    if (longOperationResult.HasValue)
                    {
                        return(longOperationResult.Value);
                    }

                    await polling.WaitForNextAttempt().ConfigureAwait(false);
                }
            }
            public async Task <T> WaitForCompletion()
            {
                var polling = pollingStrategy.Start();

                while (true)
                {
                    var taskResult = await checkStatusAsync(TaskId).ConfigureAwait(false);

                    if (taskResult.TryGetSuccessResult(out var successResult))
                    {
                        return(successResult);
                    }

                    if (taskResult.TryGetTaskError(out var apiError))
                    {
                        throw Errors.LongOperationFailed(apiError);
                    }

                    await polling.WaitForNextAttempt().ConfigureAwait(false);
                }
            }