static string queueName = "<QUEUE NAME>/$deadletterqueue";


    static async Task ReceiveMessagesAsync()
    {
        await using (ServiceBusClient client = new ServiceBusClient(connectionString))
        {
            // create a processor that we can use to process the messages
            ServiceBusProcessor processor = client.CreateProcessor(queueName, new ServiceBusProcessorOptions());

            // add handler to process messages
            processor.ProcessMessageAsync += MessageHandler;

            // add handler to process any errors
            processor.ProcessErrorAsync += ErrorHandler;

            // start processing 
            await processor.StartProcessingAsync();

            Console.WriteLine("Wait for a minute and then press any key to end the processing");
            Console.ReadKey();

            // stop processing 
            Console.WriteLine("\nStopping the receiver...");
            await processor.StopProcessingAsync();
            Console.WriteLine("Stopped receiving messages");
        }
    }