AzureIoTHub.ReceiveCloudToDeviceMessageAsync C# (CSharp) Method

    public static async Task<string> ReceiveCloudToDeviceMessageAsync()
    {
        var deviceClient = DeviceClient.CreateFromConnectionString(deviceConnectionString, TransportType.Amqp);

        while (true)
        {
            var receivedMessage = await deviceClient.ReceiveAsync();

            if (receivedMessage != null)
            {
                var messageData = Encoding.ASCII.GetString(receivedMessage.GetBytes());
                await deviceClient.CompleteAsync(receivedMessage);
                return messageData;
            }

            await Task.Delay(TimeSpan.FromSeconds(1));
        }
    }
}

        static void DoReceives(CancellationToken ct, string iotHubConnectionString)
        {
            // Was cancellation already requested?
            if (ct.IsCancellationRequested == true)
            {
                Console.WriteLine("DoReceives was cancelled before it got started.");
                ct.ThrowIfCancellationRequested();
            }

            var deviceClient = DeviceClient.CreateFromConnectionString(iotHubConnectionString, TransportType.Amqp);

            while (true)
            {
                //receive cloud messages
                var rcvTask = AzureIoTHub.ReceiveCloudToDeviceMessageAsync(deviceClient);
                rcvTask.Wait(ct);
                Console.WriteLine("Received message from cloud: {0}", rcvTask.Result);

                if (ct.IsCancellationRequested)
                {
                    Console.WriteLine("Task DoReceives cancelled");
                    ct.ThrowIfCancellationRequested();
                }
            }
        }