Frequently Asked Questions (FAQ)

❓ FAQ: Intermediate C# Concepts

🔹 Q1: When should I use an interface vs abstract class?

Use interfaces for defining capabilities (e.g., IDrawable) across unrelated types. Use abstract classes when you want to provide a shared base with some default implementation.

🔹 Q2: How is LINQ different from SQL?

LINQ provides SQL-like querying for in-memory collections (like arrays, lists). It's strongly typed, integrated into C#, and checked at compile-time.

🔹 Q3: What’s the difference between Task, Thread, and async?

• Task is a unit of asynchronous work.
• Thread is a lower-level OS-managed thread.
• async methods use Task to manage background operations without blocking.

🔹 Q4: How do delegates improve flexibility?

Delegates allow you to pass behavior (methods) as parameters, enabling loose coupling and callbacks, essential for building reusable libraries and UI frameworks.

🔹 Q5: Are records better than classes?

Records are optimized for immutable data containers and value equality (e.g., DTOs). Use classes when you need mutability or inheritance.