Resend dead letters from Azure Servicebus. Read more on http://www.anderbakk.com/resend-dead-letters-from-an-azure-service-bus-queue/

resenddeadletters.cs

public static async Task ResendDeadLetters(string servicebusConnectionString, string queueName)
{
    var messageFactory = MessagingFactory.CreateFromConnectionString(servicebusConnectionString);
    var deadletterReceiver = await messageFactory.CreateMessageReceiverAsync(QueueClient.FormatDeadLetterPath(queueName),
        ReceiveMode.PeekLock);
    var sender = await messageFactory.CreateMessageSenderAsync(queueName);
    const int max = 100;
    var current = 0;

    //Run until the Dead Letter Queue is empty or take the max number of messages
    while (current < max)
    {
        var deadLetter = await deadletterReceiver.ReceiveAsync(TimeSpan.Zero);
        if (deadLetter != null)
        {
            var newMessage =
                new BrokeredMessage(deadLetter.GetBody<Stream>())
                {
                    ContentType = deadLetter.ContentType,
                    CorrelationId = deadLetter.CorrelationId
                };
            await sender.SendAsync(newMessage);
            await deadLetter.CompleteAsync(); //Removes the message from the dead letter queue
            current++;
        }
        else
        {
            break;
        }
    }
}