EventHub json serialization

EventHub.cs

async void Main()
{
	var mf = MessagingFactory.CreateFromConnectionString("***");
    var eventHubClient = mf.CreateEventHubClient("test");
  	Random rnd = new Random();
	  Parallel.For(1, 11, deviceId => 
			{
				for(int cnt = 0; cnt < 100; cnt++)
				{
					Console.WriteLine ("Sending event nr {1} for device {0}", cnt, deviceId);
					var reading = new TelemetryInfo{ DeviceId = "Device" + deviceId.ToString(), ErrorReading = false, MainValue = 30 * rnd.NextDouble(), Timestamp = DateTime.UtcNow, Type =TelemetryType.Temperature };
					EventData msg = new EventData(Encoding.UTF8.GetBytes(reading.ToCsv()));
					eventHubClient.Send(msg);
					Thread.Sleep(TimeSpan.FromSeconds(2));
				}
			}
		);
}

public class TelemetryInfo
{
   public bool ErrorReading { get; set; }
   public DateTime Timestamp { get; set; }
   public string DeviceId { get; set; }
   public TelemetryType Type { get; set; }
   public Dictionary<string, object> ExtendedData { get; set; }
   public object MainValue { get; set; }

   public string ToJson()
   {
		return JsonConvert.SerializeObject(this);
   }
   
   public string ToCsv()
   {
       var telemetryBuilder = new StringBuilder();
	   telemetryBuilder.AppendLine("DeviceId;MainValue;Timestamp;Type;ErrorReading");
	   telemetryBuilder.AppendLine(string.Format("{0};{1};{2};{3};{4}", this.DeviceId, this.MainValue, this.Timestamp, this.Type, this.ErrorReading));
	   return telemetryBuilder.ToString();
   }
}

    public enum TelemetryType
    {
        Temperature = 0,
        SwitchStatus = 1,
        LightStatus = 2,
        CurtainStatus = 3,
        Weight = 4,
        Distance = 5,
        Daylight = 6,
        WaterLevel = 7
    }