How to write clean, maintainable C# code?
💡 Concept: Clean and Maintainable Code
Writing clean code makes it easier to understand, modify, and extend, reducing bugs and technical debt.
📘 Quick Intro
Clean code follows conventions, is well-organized, and uses meaningful names.
🧠 Analogy
Like organizing a workspace so tools are easy to find and use efficiently.
🔧 Technical Explanation
- Follow consistent naming conventions.
- Write small, focused methods and classes.
- Use comments to explain why, not what.
- Keep code DRY (Don't Repeat Yourself).
- Use design patterns and SOLID principles.
🎯 Use Cases
- ✅ Developing large scale applications.
- ✅ Collaborative team projects.
- ✅ Projects requiring frequent updates.
- ✅ Legacy code refactoring.
💻 Code Example
public class Calculator {
public int Add(int a, int b) {
return a + b;
}
// Avoid complex method doing multiple things
// Instead, keep methods simple and focused
}
❓ Interview Q&A
Q1: Why write clean code?
A: Easier maintenance and fewer bugs.
Q2: What is DRY?
A: Don't Repeat Yourself principle.
Q3: Why use SOLID principles?
A: To create flexible and scalable code.
Q4: How to name variables?
A: Meaningfully and consistently.
Q5: Should comments explain code?
A: Explain why, not what.
Q6: Why keep methods small?
A: Easier to test and understand.
Q7: How to handle legacy code?
A: Refactor gradually.
Q8: Is code formatting important?
A: Yes, for readability.
Q9: What tools help clean code?
A: Linters and analyzers.
Q10: Is clean code faster?
A: Not necessarily, but more maintainable.
📝 MCQs
Q1. Why write clean code?
- Faster code
- Easier maintenance
- More bugs
- Less security
Q2. What is DRY?
- Do Repeat Yourself
- Don't Repeat Yourself
- Debug Regularly
- Document Routinely
Q3. Why use SOLID?
- Complex code
- Flexible code
- Slow code
- Buggy code
Q4. How to name variables?
- Random names
- Meaningful names
- Short names
- Numbers
Q5. What comments should explain?
- What code does
- Why code works
- How code works
- Nothing
Q6. Why keep methods small?
- Faster to write
- Easier to test
- More lines
- Less maintainable
Q7. How to handle legacy code?
- Ignore it
- Rewrite everything
- Refactor gradually
- Delete it
Q8. Is code formatting important?
- No
- Yes
- Sometimes
- Never
Q9. What tools help clean code?
- Debuggers
- Linters and analyzers
- Compilers
- Formatters
Q10. Is clean code faster?
- Always faster
- More maintainable
- Less secure
- More complex
💡 Bonus Insight
Clean code leads to better collaboration and easier long-term maintenance.
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