Best way to asynchronously receive all brokered messages from the service bus

Question

Here is what I am trying to achieve :

1. On the service bus I have a topic which contains 5005 messages.

2. I need to peek all the messages without completing them and add them to a list (List<BrokeredMessage>)

Here is what I am trying :

IEnumerable<BrokeredMessage> dlIE = null;
List<BrokeredMessage> bmList = new List<BrokeredMessage>();
long i = 0;
while (i < count) //count is the total messages in the subscription
 {
  dlIE = deadLetterClient.ReceiveBatch(100);
  bmList.AddRange(dlIE);
  i = i + dlIE.Count();
 }

In the above code I can only fetch 100 messages at a time since there is a batch size limit to retrieving the messages.

I have also tried to do asynchronously but it always returns 0 messages in the list. This is the code for that:

static List<BrokeredMessage> messageList = new List<BrokeredMessage>();
long i = 0;          
 while (i < count)
            {
                var task = ReceiveMessagesBatchForSubscription(deadLetterClient);
                i = i + 100;
            }
            Task.WaitAny();



public async static Task ReceiveMessagesBatchForSubscription(SubscriptionClient deadLetterClient)
        {
            while (true)
            {
                var receivedMessage = await deadLetterClient.ReceiveBatchAsync(100);
                messageList.AddRange(receivedMessage);
            }
        }

Can anyone please suggest a better way to do this?