Service Communication Patterns in .NET Core and Azure

Short summary

Azure Service Bus delivers enterprise-grade pub-sub messaging with topics, ordering guarantees, and advanced routing; ideal for multi-subscriber scenarios and messages up to 100MB. Azure Queue Storage provides simpler FIFO point-to-point messaging at lower cost with 64KB limits, best for basic work queues. .NET 9 improves both patterns with better performance, distributed tracing via Activity.Current, and simplified consumer patterns using BackgroundService.

• •Azure Service Bus vs Queue Storage: choose pub-sub with advanced routing for complex scenarios, FIFO for simple work queues
• •.NET 9 adds improved distributed tracing and performance optimizations for messaging processors
• •Code examples show producer-consumer pattern with idempotency checks, dead-lettering, and cancellation handling

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