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C#/.NET - 50 Essential Interview Questions (Junior Level)
Rating: 4.8 out of 5(930 ratings)
6,894 students

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

SOLID, OOP and design patterns. I conducted 250+ tech interviews and I know what is asked. Don't memorize, understand.
Created byElegant Code – Krystyna Ślusarczyk
Last updated 8/2026
English
EnglishPortuguese [Auto],

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.

Coding Exercises

This course includes our updated coding exercises so you can practice your skills as you learn.

See a demo
Image of coding exercise example

Course content

52 sections • 61 lectures • 6h 59m total length

  • Welcome! (Basic information and how to get help)3:43

    Kickstart your C#/.NET junior interview prep with 50 videos, quizzes, and a PDF with answers. Access bonus questions, code solutions, an e-book, a learning plan, flashcards, and Q&A support.

  • 50 seconds about your instructor0:50

    Krystyna, a C# developer since 2013 and technical lead, shares focused guidance for junior developers on essential C#/.NET interview questions, drawing from 250 plus technical interviews.

  • C#, .NET and Visual Studio Versions0:26
  • (Windows) Installing Visual Studio Community2:33

    Install visual studio community on windows and set up .net desktop development to create and run c# code. Follow step-by-step installation, privacy prompts, restarts, and optional microsoft account login.

  • (MacOS) Installing Visual Studio Code6:16

    Install the .NET SDK and Visual Studio Code on macOS, add the C# Dev Kit extension, and verify the setup with dotnet --info for C# development.

  • Accessing the code3:29

    Access the course code from the GitHub repository, download as zip or clone with git, unzip on Windows, and build in Visual Studio or VS Code to verify zero errors.

  • Coding exercises troubleshooting1:53

Requirements

  • You know C# basics: variables, loops, conditions, and how to create a class. No advanced topics required.

Description

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.

Who this course is for:

  • Junior C# developers preparing for their first or next job interview.
  • C# developers who want to fill knowledge gaps in OOP, SOLID, and design patterns.
  • Self-taught programmers who want to structure and solidify their C# fundamentals.
  • Anyone getting back into C# after a break and needing a focused refresher.

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