Azure Durable Functions with .NET 10: Orchestrate Reliable Long-Running Serverless Workflows and Stateful Business Processes with C#

Long-running cloud workflows can look intimidating—especially when retries, failures, replay, external events, and human approvals enter the picture. This book makes them understandable, practical, and manageable.

Azure Durable Functions with .NET 10 is a step-by-step guide to building reliable, stateful, long-running serverless workflows with C# and the modern .NET isolated worker model. You do not need previous experience with Azure Durable Functions, workflow engines, deterministic replay, sagas, or distributed orchestration. Basic familiarity with C# is helpful, and every Durable Functions concept is introduced progressively before it is used in larger implementations.

Rather than overwhelming you with isolated examples, the book guides you through FulfilmentFlow, a realistic order-fulfilment and exception-management application that grows chapter by chapter. You will learn by building, testing, troubleshooting, and improving a complete workflow system.

Mistakes are treated as part of the learning process. Each successful orchestration, recovered failure, correctly handled timeout, and completed workflow becomes another practical win that strengthens your confidence.

• Step-by-step, implementation-focused explanations

• Practical C# and .NET 10 examples using Azure Functions

• One cumulative real-world project instead of disconnected demos

• Clear coverage of orchestrators, activities, replay, and determinism

• Durable timers, external events, human approvals, and workflow state

• Production-focused reliability, security, testing, observability, and deployment

• Verification checklists, review questions, exercises, and troubleshooting guidance

• Build long-running and stateful serverless workflows

• Design orchestrators and activity functions correctly

• Understand durable execution, event history, replay, and deterministic code

• Create sequential, parallel, fan-out/fan-in, and sub-orchestration workflows

• Use durable timers, external events, reminders, approvals, and escalation

• Manage workflow instances and Durable Entities

• Apply retries, idempotency, compensation, and saga-style recovery

• Control concurrency, scaling, payload size, security, and task-hub isolation

• Test, monitor, trace, troubleshoot, version, and deploy production workflows

• Use Durable Task Scheduler, managed identity, Bicep, and CI/CD effectively

This book is ideal for C# and .NET developers who want to learn Azure Durable Functions from the ground up and progress toward production-ready workflow engineering. It is especially useful for developers building business processes that must survive delays, failures, restarts, retries, external callbacks, and human decisions. Prior Durable Functions experience is not required.

1. Durable Execution with Azure Functions and .NET 10

2. Orchestrators, Activities, Replay, and Determinism

3. Building Reliable Sequential Workflows

4. Parallel Workflows and Orchestration Decomposition

5. Durable Waiting, External Events, and Human Interaction

6. Workflow State and Instance Lifecycle Management

7. Failure Handling, Retries, Idempotency, and Compensation

8. Scaling, Performance, Data, and Security

9. Testing, Observability, and Troubleshooting

10. Workflow Versioning, Deployment, and Production Operations

If you are ready to move from fragile background processes to reliable, production-ready workflow orchestration, start building with Azure Durable Functions, C#, and .NET 10 today.