Switch Statement

Console.WriteLine("Hello C#");

• C# is used for backend APIs, desktop apps, games (Unity), and enterprise systems.
• SaaS products use Switch Statement in services, dashboards, background jobs, and API workflows.
• ERP and banking systems apply Switch Statement with validation, logging, review, and rollback plans.
• E-commerce and healthcare platforms use Switch Statement carefully because reliability and data correctness matter.

• Mixing async and blocking calls (deadlocks/timeouts).
• Skipping the small working example before adding framework code.
• Ignoring null, empty, duplicate, and boundary inputs.
• Mixing business logic, input handling, and output formatting in one place.
• Using broad error handling that hides the real failure.
• Forgetting to test the behavior after refactoring.
• Adding clever code that future maintainers will struggle to read.
• Not checking performance on realistic input sizes.

• Use clear naming, prefer async/await for I/O, and keep methods small.
• Start with clear requirements and one minimal working example.
• Use meaningful names that explain business intent.
• Keep examples small enough to debug line by line.
• Validate input at every trust boundary.
• Handle errors explicitly and preserve useful context.
• Prefer simple control flow over deeply nested logic.
• Separate domain logic from I/O and framework code.
• Write tests for normal, boundary, and failure cases.
• Review security assumptions before production use.
• Measure performance before optimizing.
• Document non-obvious decisions close to the code or in project notes.
• Use official documentation when behavior is version-specific.
• Keep dependencies current and remove unused code.
• Avoid hardcoded secrets, credentials, and environment-specific paths.
• Log operational events without exposing sensitive data.
• Design examples so learners can safely modify and rerun them.
• Prefer maintainability over short-term cleverness.