in Hands-on lab/simulated-device/SimulatedDevice.cs [85:93]
private static void Main(string[] args)
{
Console.WriteLine("IoT Hub Quickstarts #1 - Simulated device. Ctrl-C to exit.\n");
// Connect to the IoT Hub using the MQTT protocol
s_deviceClient = DeviceClient.CreateFromConnectionString(s_connectionString, TransportType.Mqtt);
SendDeviceToCloudMessagesAsync();
Console.ReadLine();
}