Interview Questions

C# Extension Methods: Add Functionality Without Inheritance or Wrappers

Discover how C# extension methods let you inject behavior into types you can’t change. Learn when to use them, see practical examples, and follow best practices for clean, maintainable code without inheritance or wrappers.

Recommended Middleware Order in ASP.NET Core for Secure, Fast, and Correct Pipelines

Discover the optimal middleware order for ASP.NET Core. See why each step matters, how to avoid common pitfalls, and use a proven pipeline template for secure, fast, and maintainable web APIs.

ASP.NET Core Middleware: Difference Between Use, Run, and Map Explained

Learn the key differences between Use, Run, and Map in ASP.NET Core middleware. See practical analogies, code samples, and a comparison table to master pipeline flow and build clean, maintainable APIs.

Tuples vs Custom Types in C#: Clean Code or Lazy Hack?

Discover when to use tuples, record structs, or classes in C#. Learn the pros and cons for private methods, public APIs, and evolving code. See practical examples and a comparison table to make the best choice for clean, maintainable software.

C# Default Interface Methods vs Abstract Methods: Differences, Use Cases, and Best Practices

TL;DR - Default Interface Methods vs Abstract Methods Use default interface methods for API evolution and optional behavior without breaking existing code. Use abstract methods and classes for shared state, dependency injection, and complex inheritance. Interfaces support multiple inheritance; abstract classes do not. Abstract classes allow fields, constructors, and access modifiers; interfaces do not. Performance is similar; choose based on design and maintainability. Default interface methods arrived in C# 8, letting you add implementation directly to interfaces. But when should you use them over traditional abstract methods? ...

C# Abstract Class vs Interface: 10 Real-World Questions You Should Ask

TL;DR - abstract vs interface Abstract class: Shared implementation + state management, supports constructors for initialization Interface: Pure contracts + multiple inheritance, no constructors Use abstract classes when you need shared logic, protected members, or default behavior that can be overridden Use interfaces when you need flexible contracts, multiple inheritance, or mocking capabilities 1. When should you choose an abstract class over an interface in C#? Choose abstract classes when you need shared implementation logic and state management across derived types. Interfaces work for contracts, but abstract classes handle common behavior. ...

Method Overloading vs Overriding in C#: Key Differences and Examples

Learn the key differences between method overloading and overriding in C#. See clear code examples, a quick comparison table, and practical interview tips. Master these essential OOP concepts to write flexible, maintainable, and testable C# code.