queueClient.SendAsync(message) doesnt send msg consistently - azure

Question

The below program sends the message to the queue, however most of the times the message is not sent.
I am using the Sender() method (as shown below) in my class library. This is being called from a Cloud Service(Worker Role). Please help to identify why the message is not consistently sent and correcting the code.
{
static void Main(string[] args)
{
Sender();
Console.ReadKey();
}
private static void Sender()
{
var ConnectionString = "<<Connectionstring>>";
var QueueName = "samplequeue";
var queueClient = new QueueClient(ConnectionString, QueueName);
try
{
for (var i = 0; i < 5; i++)
{
// Create a new message to send to the queue
string messageBody = $"Message {i}";
var message = new Message(Encoding.UTF8.GetBytes(messageBody));
// Write the body of the message to the console
Console.WriteLine($"Sending message: {messageBody}");
// Send the message to the queue
queueClient.SendAsync(message);
}
}
catch (Exception ex)
{
Console.WriteLine("Message queue failed\n" + ex.Message);
}
finally
{
Console.WriteLine("Message queued");
}
}
}

Answer 1

I believe the problem is that you're not awaiting the execution of an async method.
queueClient.SendAsync(message)
One option would be to change the above call and wait for the execution to complete
await queueClient.SendAsync(message);
In this case you will need to make Sender method async as well and then wait for it to complete in your Main method.
Other option would be to use Sync version of the method:
queueClient.Send(message);

Answer 2

You must wait on the call to complete. Otherwise it will be run in the background.
That means that Message 4 might complete after Message 3 (since you have a loop) or that it wont complete at all if your console application exits before it have a chance.
Since you are using a synchronous application, you can invkoe Send() like this:
queueClient.SendAsync(message).GetAwaiter().GetResult();
See .Result vs .GetAwaiter().GetResult()