private static void deleteOneSubscription(IoTDAClient client)
        {
            DeleteSubscriptionRequest req = new DeleteSubscriptionRequest
            {
                SubscriptionId = "4c961c93-376c-4083-9c27-2e88b43b3c0d"
            };

            try
            {
                var resp = client.DeleteSubscription(req);
                Console.WriteLine(resp.HttpStatusCode);
                Console.WriteLine(resp);
            }
            catch (RequestTimeoutException requestTimeoutException)
            {
                Console.WriteLine(requestTimeoutException.ErrorMessage);
            }
            catch (ServiceResponseException clientRequestException)
            {
                Console.WriteLine(clientRequestException.HttpStatusCode);
                Console.WriteLine(clientRequestException.ErrorCode);
                Console.WriteLine(clientRequestException.ErrorMsg);
            }
            catch (ConnectionException connectionException)
            {
                Console.WriteLine(connectionException.ErrorMessage);
            }
        }