Azure Service Bus
Azure Service Bus Legacy was MSMQ. Azure Service Bus is better because: 1) No Memory Locks, 2) Dead-Lettering, 3) Scaling. Namespaces in C#: Azure.Messaging.ServiceBus (latest) Microsoft.Azure.ServiceBus (legacy - as of 30 Sep 2026) Basically you will be doing the typical pub/sub that is decoupled. Events should be immutable (so "record" type). Advantages: Loose Coupling, High Scalability, Real-time Responsiveness Challenges: Eventual Consistency, Debugging Is Hard, Payload Overhead Azure Service Bus is primarily a Broker topology (rather than a mediator). Steps: 1) E vent: public record OrderPlacedEvent(Guid OrderId, string CustomerEmail, decimal TotalAmount); 2) Producer (Publishes to Azure Topic) : using System.Text.Json; using Azure.Messaging.ServiceBus; public class AzureEventPublisher { private readonly ServiceBusSender _sender; ...