public CallSettings GetPullSetting()
    {
        CallTiming timing = CallTiming.FromRetry(new RetrySettings(
                retryBackoff: new BackoffSettings(new TimeSpan(0, 0, 0, 0, 50), new TimeSpan(0, 0, 5), 1),
                timeoutBackoff: new BackoffSettings(new TimeSpan(0, 0, 0, 18, 0), new TimeSpan(0, 0, 20), 1),
                totalExpiration: Google.Api.Gax.Expiration.FromTimeout(TimeSpan.FromMilliseconds(600000))));

        return CallSettings.FromCallTiming(timing);
    }

public void PullTest()
        {
            var cont = true;
            SubscriberSettings settings = new SubscriberSettings()
            {
                PullSettings = GetPullSetting()
            };
            SubscriberClient subscriberClient = SubscriberClient.Create(settings: settings);
            var subscriberName = new SubscriptionName("project-name", "subscription-name");
            while (cont)
            {
                try
                {
                    PullResponse response = subscriberClient.Pull(subscriberName, returnImmediately: false, maxMessages: 1);
                    System.Diagnostics.Trace.WriteLine(">>>>>> " + DateTime.Now.ToString());
                    System.Diagnostics.Trace.WriteLine(">>>>>> " + "Job Recieved" + response.ReceivedMessages.ToList().FirstOrDefault());
                    subscriberClient.Acknowledge(subscriberName, new List<string>() { response.ReceivedMessages.ToList().FirstOrDefault().AckId });
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Trace.WriteLine(">>>>>> " + DateTime.Now.ToString());
                    System.Diagnostics.Trace.WriteLine(">>>>>> " + ex.Message);
                }
            }
        }

 public CallSettings GetPullSetting()
        {
            CallTiming timing = CallTiming.FromRetry(new RetrySettings(
                    retryBackoff: new BackoffSettings(new TimeSpan(0, 0, 0, 0, 50), new TimeSpan(0, 0, 5), 1),
                    timeoutBackoff: new BackoffSettings(new TimeSpan(0, 0, 0, 18, 0), new TimeSpan(0, 0, 20), 1),
                    totalExpiration: Google.Api.Gax.Expiration.FromTimeout(TimeSpan.FromMilliseconds(600000))));

            return CallSettings.FromCallTiming(timing);
        }