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Udemy

C#/.NET - 50 Essential Interview Questions (Junior Level)

via Udemy

Overview

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SOLID, OOP and design patterns. I conducted 250+ tech interviews and I know what is asked. Do not memorize, understand.

What you'll learn:
  • Answer 50 essential C# interview questions with confidence — plus 110 bonus questions to cover every angle.
  • Explain OOP concepts like a pro — inheritance, polymorphism, abstraction, and encapsulation with real examples.
  • Apply SOLID principles and know exactly how to explain them when asked — one of the top interview topics.
  • Understand 5 popular design patterns and when to use each — not just definitions, but real-world reasoning.
  • Practice by solving coding exercises directly in the browser — no setup needed, just code and learn.
  • Created by a Tech Lead who's conducted 250+ technical interviews — real questions, not textbook theory.
  • Get a free e-book with all questions and answers — perfect for a quick review before your interview.
  • Study on the go with printable flashcards and an Anki deck — review key concepts anywhere, anytime.

Why this course?

I've conducted over 250 technical interviews as a .NET Technical Lead. I've seen what separates candidates who get hired from those who don't — and it's rarely about memorizing definitions. It's about truly understanding how C# works under the hood.

This course teaches you exactly that. We go through 50 essential C# interview questions in depth, plus 110 bonus questions — 160 real-world questions total. Each one is explained so you understand why the answer is correct, not just what to say.


What makes this course different?

Most interview prep courses are question dumps — here's the question, here's the answer, memorize it. This course takes a different approach:

  • We learn by coding. Topics are explained with hands-on examples, and the course includes 8 in-browser coding exercises to reinforce your understanding.

  • We go deep. Each topic is broken down so you can handle follow-up and trick questions with confidence.

  • We cover what actually gets asked. The questions in this course are based on real interviews, not pulled from a textbook.


What's inside?

7 hours of video covering the topics interviewers care about most:

  • Object-oriented programming — inheritance, polymorphism, abstraction, encapsulation

  • SOLID principles — with practical examples, not just acronym definitions

  • 5 popular design patterns — when and why to use each one

  • C# core mechanisms — the things that come up in almost every interview


Included with the course:

  • Free e-book with all questions and answers — perfect for a quick review the night before your interview

  • Printable flashcards + Anki deck — study on the go, anywhere, anytime

  • Full Git repository with all the code from the lectures

  • 8 in-browser coding exercises to practice as you learn


Not preparing for an interview right now?

That's fine too. Many students take this course simply to deepen their understanding of C# and fill knowledge gaps. Interview questions are a great framework for learning — they force you to think about the "why" behind every concept, which makes you a better programmer regardless of whether you have an interview coming up.


This course is covered by Udemy’s 30-day Refund Policy, so you can try it out risk-free.

Syllabus

  • Introduction
  • What is the Common Intermediate Language (CIL)?
  • What is the Common Language Runtime (CLR)?
  • What is the difference between C# and .NET?
  • What is the difference between value types and reference types?
  • What is boxing and unboxing?
  • What are the three main types of errors?
  • How are exceptions handled in C#?
  • What are the types of access modifiers in C#?
  • What are the default access modifiers in C#?
  • What is the purpose of the "sealed" modifier?
  • What is the purpose of the "params" keyword?
  • What is the difference between a class and a struct?
  • What are partial classes?
  • What does the "new" keyword do?
  • What is the purpose of the "static" keyword?
  • What is a static class?
  • What is the purpose of the ternary conditional operator?
  • What is the purpose of the null coalescing and null conditional operators?
  • What is encapsulation?
  • What is LINQ?
  • What are extension methods?
  • What is IEnumerable?
  • What is the difference between the equality operator (==) and Equals?
  • What is the difference between deep copy and shallow copy?
  • What is the Garbage Collector?
  • What are nullable types?
  • What is a property?
  • What are generics?
  • What is the difference between the "const" and the "readonly" modifiers?
  • What is the difference between the "ref" and the "out" keywords?
  • What is the difference between an interface and an abstract class?
  • What is polymorphism?
  • What's the difference between a virtual method and an abstract method?
  • What is the method overloading?
  • What is the difference between method overriding and method hiding?
  • Does C# support multiple inheritance?
  • What is the DRY principle?
  • What is the "magic number" antipattern?
  • Why is using the "goto" keyword considered a bad practice?
  • What is the "spaghetti code"?
  • What is the Singleton design pattern?
  • What is the Builder design pattern?
  • What is the Adapter design pattern?
  • What is the Bridge design pattern?
  • What is the Factory Method design pattern?
  • What is the "S" in the SOLID principles?
  • What is the "O" in the SOLID principles?
  • What is the "L" in the SOLID principles?
  • What is the "I" in the SOLID principles?

Taught by

Elegant Code – Krystyna Ślusarczyk

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4.8 rating at Udemy based on 896 ratings

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