
## Why this series?

Writing code that "works" is not enough in production systems. Clean code makes your C# codebase easier to:

- maintain
- debug
- onboard new developers
- change safely as business rules evolve

This series breaks clean-code practices into small, practical topics with examples you can apply immediately.

## Series index

1. **Naming and Method Design**  
   Focus: naming conventions, small methods, guard clauses, parameter objects, avoiding side effects.

2. **Class Design and SOLID in Real Projects**  
   Focus: SRP, dependency inversion, composition over inheritance, and cohesive classes.

3. **Error Handling and Defensive Coding in ASP.NET Core**  
   Focus: specific exceptions, logging, `ProblemDetails`, request validation, and immutability.

4. **Code Smells and Refactoring Patterns**  
   Focus: long methods, primitive obsession, data clumps, duplicated code, magic numbers.

5. **Testing for Maintainability**  
   Focus: testable architecture, AAA, naming conventions for tests, behavior-first testing.

6. **Modern C# Features for Cleaner Code**  
   Focus: records, pattern matching, collection expressions, raw string literals, and primary constructors.

## Quick checklist

Use this list during code reviews:

- Are names intention-revealing?
- Are methods doing one thing?
- Are classes cohesive with one reason to change?
- Are expected failures handled without exceptions-for-flow?
- Are API errors returned with a consistent structure?
- Are business concepts modeled as types instead of plain `string`/`int`?
- Is logic tested through behavior, not implementation details?

## Suggested reading order

- Newer developers: 1 -> 2 -> 3 -> 5 -> 4 -> 6
- Experienced developers modernizing legacy code: 4 -> 2 -> 3 -> 5 -> 6 -> 1

## Final note

You do not need to apply everything at once. Improve code incrementally: one method, one class, one refactor at a time.


Start here for a practical C# clean code series focused on naming, methods, SOLID, error handling, testing, and modern C# features.

Software Engineering

C# Clean Code Series — Roadmap for Production-Quality Code