Udemy

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

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  • 5,495 Students
  • Updated 12/2025
4.8
(573 Ratings)
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Course Information

Registration period
Year-round Recruitment
Course Level
Study Mode
Duration
8 Hour(s) 4 Minute(s)
Language
English
Taught by
Krystyna Ślusarczyk
Rating
4.8
(573 Ratings)

Course Overview

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

Get ready for your next interview! An in-depth guide to crucial C# topics, design principles and popular patterns.

Welcome to the "C#/.NET - 50 Essential Interview Questions (Mid Level)" course!


Are you looking to land your next C# job with confidence? This course is designed to help you master the most common C# interview questions, gain in-depth knowledge of key C# topics, and stand out from other candidates.


With over 250 technical interviews conducted as a .NET Technical Lead, I know exactly what hiring managers are looking for—and I’m here to help you succeed.


Curious about what to expect? Watch the free video on one of the most common C# interview questions: "What is the difference between string and StringBuilder?"


This course covers 50 essential C# interview questions, plus bonus questions, bringing the total to 150 real-world interview questions you might face.

  • Practice makes perfect – We will learn by coding.

  • Go beyond memorization – Understand why each answer is correct.

  • Master key concepts – Deep dive into C# advanced topics, collections, and popular design patterns.


This course isn't just for those preparing for an interview. Even if you're not actively job hunting, it's a great way to strengthen your C# skills.


We will look under the hood of the C# mechanisms that are most often discussed during the interviews, so no trick question can surprise you. Each topic will be explained in detail, so you will not only be able to give the interviewer a satisfying answer to the question, but you will also gain a deep understanding of those subjects and become a better programmer.


This course is focused on topics that you are most likely to talk about during interviews. We will discuss various subjects, from low-level things like using reflection or the "dynamic" keyword, through modern C# subjects like pattern matching or nullable reference types, to high-level matters like design principles and patterns or good coding practices.


Thanks to this course, you will be well-prepared for your next interview, and you will discuss C# matters with confidence.


Additional perks:

  • Free e-book: Get a comprehensive e-book that compiles all the questions and answers from the course, giving you a quick reference guide.

  • Free e-book (Junior-level topics review): Explore 15 essential junior-level topics to help you get up to speed for this course.

  • Flashcards deck: Printable flashcards and an Anki deck are included to help you review key concepts efficiently.

  • A Git repository containing all the lectures' code.

  • 30-day money-back guarantee—if you're not satisfied, get a full refund, no questions asked.


So, why hesitate? Join me in this course and ace your next interview!

Course Content

  • 10 section(s)
  • 59 lecture(s)
  • Section 1 Introduction
  • Section 2 What is the difference between Tuples and ValueTuples?
  • Section 3 What is the difference between "is" and "as" keywords?
  • Section 4 What is the use of the “using” keyword?
  • Section 5 What is the purpose of the “dynamic” keyword?
  • Section 6 What are expression-bodied members?
  • Section 7 What are Funcs and lambda expressions?
  • Section 8 What are delegates?
  • Section 9 How does the Garbage Collector decide which objects can be removed from memory?
  • Section 10 What are generations?

What You’ll Learn

  • Prepare for 50 essential C# interview questions. With bonus questions, learn answers to 150 interview questions in total!
  • Explore advanced C# topics: events, lambda expressions, reflection and more.
  • Get ready for tricky questions by gaining a deep understanding of the C#-related topics.
  • Gain an in-depth understanding of the fundamental C# collections.
  • Learn crucial design principles and best coding practices.
  • Practice by solving in-browser coding exercises.
  • Get two free e-books!
  • Get to know 5 popular design patterns.


Reviews

  • R
    Rama Krishna
    5.0

    Learning all new things. thanks for your coding exercises also.

  • A
    Avinash M
    4.5

    It’s definitely worth reviewing. Good questions and answers should focus on being more engaging and interactive.

  • M
    Muzammil Ansari
    5.0

    very well explained

  • P
    Pavel H
    5.0

    This is so far the best course I've taken on Udemy. I consider myself to be quite experienced developer. I found this course and one of the topics caught my attention so I opened it. I ended up going through the whole course because it's packed with useful information and contains a lot of small details that I was surprised that I didn't know. This is an excellent course, very well-made and I wouldn't hesitate to recommend it also for more experienced developers that want to know C# language really wel in all its details.

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