Course Information
Registration period
Year-round Recruitment
Course Level
Study Mode
Duration
6 Hour(s) 58 Minute(s)
Language
English
Taught by
Elegant Code – Krystyna Ślusarczyk
Rating
Course Overview
SOLID, OOP and design patterns. I conducted 250+ tech interviews and I know what is asked. Do not memorize, understand.
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.
Course Content
- 52 section(s)
- 60 lecture(s)
- Section 1 Introduction
- Section 2 What is the Common Intermediate Language (CIL)?
- Section 3 What is the Common Language Runtime (CLR)?
- Section 4 What is the difference between C# and .NET?
- Section 5 What is the difference between value types and reference types?
- Section 6 What is boxing and unboxing?
- Section 7 What are the three main types of errors?
- Section 8 How are exceptions handled in C#?
- Section 9 What are the types of access modifiers in C#?
- Section 10 What are the default access modifiers in C#?
- Section 11 What is the purpose of the "sealed" modifier?
- Section 12 What is the purpose of the "params" keyword?
- Section 13 What is the difference between a class and a struct?
- Section 14 What are partial classes?
- Section 15 What does the "new" keyword do?
- Section 16 What is the purpose of the "static" keyword?
- Section 17 What is a static class?
- Section 18 What is the purpose of the ternary conditional operator?
- Section 19 What is the purpose of the null coalescing and null conditional operators?
- Section 20 What is encapsulation?
- Section 21 What is LINQ?
- Section 22 What are extension methods?
- Section 23 What is IEnumerable?
- Section 24 What is the difference between the equality operator (==) and Equals?
- Section 25 What is the difference between deep copy and shallow copy?
- Section 26 What is the Garbage Collector?
- Section 27 What are nullable types?
- Section 28 What is a property?
- Section 29 What are generics?
- Section 30 What is the difference between the "const" and the "readonly" modifiers?
- Section 31 What is the difference between the "ref" and the "out" keywords?
- Section 32 What is the difference between an interface and an abstract class?
- Section 33 What is polymorphism?
- Section 34 What's the difference between a virtual method and an abstract method?
- Section 35 What is the method overloading?
- Section 36 What is the difference between method overriding and method hiding?
- Section 37 Does C# support multiple inheritance?
- Section 38 What is the DRY principle?
- Section 39 What is the "magic number" antipattern?
- Section 40 Why is using the "goto" keyword considered a bad practice?
- Section 41 What is the "spaghetti code"?
- Section 42 What is the Singleton design pattern?
- Section 43 What is the Builder design pattern?
- Section 44 What is the Adapter design pattern?
- Section 45 What is the Bridge design pattern?
- Section 46 What is the Factory Method design pattern?
- Section 47 What is the "S" in the SOLID principles?
- Section 48 What is the "O" in the SOLID principles?
- Section 49 What is the "L" in the SOLID principles?
- Section 50 What is the "I" in the SOLID principles?
- Section 51 What is the "D" in the SOLID principles?
- Section 52 Bonus!
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.
Skills covered in this course
Reviews
-
JJUSTIN TUELL
Solid group of topics, well explained, and effective quizzes following each section.
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BBohdan Bobrytskyi
Great and detailed explanations with examples, resources, quizes! I do appreciate the efforts of the author.
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VVinayak Tambe
good content
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CChris Koch
Good
