Azure Service Bus - must add fake message before send the real one - why? - azure

Question

I'm facing a strange issue, and I ran out of the possible causes. The scenario is
Fetch incoming message from queue
Process it and then add new message to another queue
but the thing is, if I finish the long running task for the incoming message, and then try to add new message to another queue, I don't receive it. If I just add a face message to that another queue, then I am able to receive the real message after the long-running operation is finished. But why ? I don't want to put any fake messages to the queue, but without that my scenario doesn't work. Any ideas ?
public class WorkerRole : RoleEntryPoint
{
// QueueClient is thread-safe. Recommended that you cache
// rather than recreating it on every request
Microsoft.ServiceBus.Messaging.QueueClient Client;
ManualResetEvent CompletedEvent = new ManualResetEvent(false);
public override void Run()
{
MyResult result = null;
var queueClient = new Microsoft.Azure.ServiceBus.QueueClient("QueueConnectionString", "QueueName");
Client.OnMessage(async (receivedMessage) =>
{
try
{
using (Stream stream = receivedMessage.GetBody<Stream>())
{
using (StreamReader reader = new StreamReader(stream))
{
string json = reader.ReadToEnd();
OCRQueueItem_Incoming item = JsonConvert.DeserializeObject<IncomingClass>(json);
var someClass = new OCRManager();
var message = new Message(Encoding.UTF8.GetBytes("test 1"));
await queueClient.SendAsync(message);
result = new SomeManager().RunLongRunningTask(item); //it runs for 1-2min
}
}
}
catch (Exception ex) { }
finally
{
var json = JsonConvert.SerializeObject(result);
var message = new Message(Encoding.UTF8.GetBytes(json));
await queueClient.SendAsync(message);
}
});
CompletedEvent.WaitOne();
}
public override bool OnStart()
{
ServicePointManager.DefaultConnectionLimit = 12;
string connectionString = CloudConfigurationManager.GetSetting("Queue.ConnectionString");
Client = Microsoft.ServiceBus.Messaging.QueueClient.Create(connectionString);
return base.OnStart();
}
public override void OnStop()
{
Client.Close();
CompletedEvent.Set();
base.OnStop();
}
}