public async Task RunTest() { var topic = "competing" + (new Random().Next()).ToString(); var subscriptionName = "subscriptionTo" + topic; await mgt.CreateTopic(topic); await mgt.CreateSubscription(topic, subscriptionName); var sender = new TopicClient(config.ConnectionString, topic); Microsoft.Azure.ServiceBus.SubscriptionClient receiver1 = new SubscriptionClient(config.ConnectionString, topic, subscriptionName, ReceiveMode.ReceiveAndDelete); receiver1.RegisterMessageHandler((message, ct) => { Console.WriteLine("Receved On Receiver 1"); System.Threading.Thread.Sleep(500); return(Task.CompletedTask); }, new MessageHandlerOptions((e) => Task.CompletedTask)); Microsoft.Azure.ServiceBus.SubscriptionClient receiver2 = new SubscriptionClient(config.ConnectionString, topic, subscriptionName, ReceiveMode.ReceiveAndDelete); receiver2.RegisterMessageHandler((message, ct) => { Console.WriteLine("Receved On Receiver 2"); System.Threading.Thread.Sleep(500); return(Task.CompletedTask); }, new MessageHandlerOptions((e) => Task.CompletedTask)); for (int x = 0; x < 10; x++) { await sender.SendAsync(new Message { Body = new byte[0], CorrelationId = Guid.NewGuid().ToString() }); } }