C# Code: Best Practices for Clean and Maintainable Software (video)

C# best practices: naming, SOLID, exceptions, nullability, async, DI, LINQ, testing, and static analysis for modern .NET.

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C# Code: Best Practices for Clean and Maintainable Software. Here's the short version.

Clean C# code is readable, testable, and aligned with modern .NET conventions. Advice differs slightly between legacy .NET Framework and .NET 8+ — this guide focuses on current .NET with nullable reference types and async-first I/O.

Naming and structure. Types and methods — PascalCase; locals — camelCase. Async methods suffix Async; avoid async void except handlers. Keep classes focused; prefer composition over giant god services.

Here's the problem in code: empty catch.

And here's the fix: log and handle deliberately.

Nullability, async, and DI. Enable nullable reference types; guard or throw on null. Use await instead of .Result on async paths. Inject dependencies via constructor; program to interfaces. Keep LINQ readable — extract complex queries to named methods.

Testing and analysis. Unit test behavior via public APIs.

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