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

Welcome to the "C#/.NET - 50 Essential Interview Questions (Junior Level)" course. Are you ready to take your knowledge and career to the next level?

I work as a C# Technical Lead and it's my job to conduct technical interviews with candidates. I will help you gain knowledge and skills that will let you ace your next interview.

This course will prepare you for the 50 most common C# interview questions. Each topic comes with several bonus questions, so we will learn the answers to 160 questions in total.

Check out the free video with one of the most popular questions from C# interviews - "What is the difference between an interface and an abstract class?"

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.

Even if you are not preparing for the interview at this moment, this course will help you to strengthen your coding skills and to connect the dots between the topics you often heard of, but perhaps never had a chance to understand in depth.

Practice makes perfect, so we will learn by coding. A Git repository is attached to this course, and there you can find code for each of the lectures.

Besides C#, we will also discuss other topics that are common during any programming interview, like the SOLID principles or the most popular design patterns.

If you like to memorize knowledge with flashcards, you will find printable cards as well as an Anki deck amongst the resources attached to this course.

Also, a free e-book is provided, with all questions and answers from the course compiled together.

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

This course comes with a 30-day money-back guarantee. If you are not satisfied, you can return it and get all your money back, no questions asked. In other words, you don't risk anything by purchasing this course. You have nothing to lose, and the knowledge you will gain may take your career to the next level.

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

What's inside

Learning objectives

Prepare for the 50 popular questions from c# technical interviews. with bonus questions, learn answers to 160 interview questions in total!
Get ready for tricky questions by gaining a deep understanding of the c#-related topics.
Master fundamental concepts of object-oriented programming.

Learn solid principles.
Get to know 5 popular design patterns.
Free e-book provided!

Prepare for the 50 popular questions from c# technical interviews. with bonus questions, learn answers to 160 interview questions in total!
Get ready for tricky questions by gaining a deep understanding of the c#-related topics.
Master fundamental concepts of object-oriented programming.
Learn solid principles.
Get to know 5 popular design patterns.
Free e-book provided!

Syllabus

Introduction

Welcome! (Basic information and how to get help)

Checking if your Version of Visual Studio supports C# 9

Installing Visual Studio

Accessing the code - link to the repository

Accessing the code

What is the Common Intermediate Language (CIL)?

Quiz

What is the Common Language Runtime (CLR)?

2. What is the Common Language Runtime (CLR)?

What are the default access modifiers in C#?

What is the difference between C# and .NET?

3. What is the difference between C# and .NET?

What is the difference between value types and reference types?

4. What is the difference between value types and reference types?

9. What are the default access modifiers in C#?

What is boxing and unboxing?

5. What is boxing and unboxing?

What are the three main types of errors?

6. What are the three main types of errors?

How are exceptions handled in C#?

7. How are exceptions handled in C#?

What does the "new" keyword do?

What are the types of access modifiers in C#?

8. What are the types of access modifiers in C#?

What is the purpose of the "sealed" modifier?

10. What is the purpose of the "sealed" modifier?

What is the purpose of the "params" keyword?

11. What is the purpose of the "params" keyword?

14. What does the "new" keyword do?

What is the difference between a class and a struct?

12. What is the difference between a class and a struct?

What are partial classes?

13. What are partial classes?

What is the purpose of the ternary conditional operator?

What is the purpose of the "static" keyword?

15. What is the purpose of the "static" keyword?

18. What is the purpose of the null coalescing and null conditional operators?

What is a static class?

16. What is a static class?

17. What is the purpose of the ternary conditional operator?

What is the purpose of the null coalescing and null conditional operators?

What is encapsulation?

19. What is encapsulation?

What is LINQ?

20. What is LINQ?

LINQ - check out my course about it.

What are extension methods?

21. What are extension methods?

What is IEnumerable?

22. What is IEnumerable?

What is the difference between the equality operator (==) and Equals?

23. What is the difference between the equality operator (==) and Equals?

What is the difference between deep copy and shallow copy?

24.What is the difference between deep copy and shallow copy?

What is the Garbage Collector?

25. What is the Garbage Collector?

What are nullable types?

26. What are nullable types?

What is a property?

27. What is a property?

What are generics?

28. What are generics?

What is the difference between the "const" and the "readonly" modifiers?

29. What is the difference between the "const" and the "readonly" modifiers?

What is the difference between the "ref" and the "out" keywords?

30. What is the difference between the "ref" and the "out" keywords?

What is the difference between an interface and an abstract class?

31. What is the difference between an interface and an abstract class?

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in C#/.NET - 50 Essential Interview Questions (Junior Level) with these activities:

Review Object-Oriented Programming (OOP) Concepts

Show steps

Solidify your understanding of OOP principles to better grasp C# concepts and interview questions related to class design and inheritance.

Browse courses on Object-Oriented Programming

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Review the core principles of OOP: encapsulation, inheritance, and polymorphism.
Practice implementing these principles in simple code examples.
Identify how these principles are applied in C#.

Implement SOLID Principles

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Practice applying SOLID principles to code examples to improve code design and prepare for interview questions on software architecture.

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Choose a small coding project or refactor existing code.
Apply each of the SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion).
Evaluate the impact of each principle on code maintainability and testability.

Explore Design Patterns in C#

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Follow tutorials to implement common design patterns in C# to enhance problem-solving skills and demonstrate practical knowledge in interviews.

Show steps

Select a few design patterns (e.g., Factory, Singleton, Observer).
Find C# tutorials or examples for each pattern.
Implement the patterns in your own code.

Four other activities

Expand to see all activities and additional details

Show all seven activities

Create Flashcards for C# Concepts

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Create flashcards covering key C# concepts and interview questions to reinforce learning and aid in memorization.

Show steps

Identify key concepts and definitions from the course.
Create flashcards with questions on one side and answers on the other.
Use the flashcards for regular review.

CLR via C#

Show steps

Deepen your understanding of the CLR to answer advanced interview questions about memory management, garbage collection, and other low-level details.

View Windows Runtime via C# (Developer Reference) on Amazon

Show steps

Read chapters related to memory management and garbage collection.
Study the sections on the Common Type System (CTS) and Common Language Specification (CLS).
Relate the concepts to C# code examples.

Build a Simple Application with SOLID Principles

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Apply SOLID principles and design patterns in a practical project to solidify your understanding and showcase your skills to potential employers.

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Choose a simple application idea (e.g., a console-based task manager).
Design the application using SOLID principles and appropriate design patterns.
Implement the application in C#.
Write unit tests to ensure code quality.

Design Patterns: Elements of Reusable Object-Oriented Software

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Study classic design patterns to improve your ability to solve complex problems and demonstrate expertise in software architecture during interviews.

View Design Patterns on Amazon

Show steps

Select a few design patterns (e.g., Factory, Singleton, Observer).
Read the corresponding chapters in the book.
Implement the patterns in C# code.

Career center

Learners who complete C#/.NET - 50 Essential Interview Questions (Junior Level) will develop knowledge and skills that may be useful to these careers:

C# Developer

A C# developer specializes in creating applications using the C# programming language. This course is specifically designed to prepare individuals for C# development roles. A C# developer uses the knowledge of common intermediate language, common language runtime, and .NET to build software for the Windows operating system. The emphasis on interview questions helps hone practical skills, while the deep dives into C# mechanisms, such as boxing and unboxing, help reinforce core concepts.

See salaries and explore the career path for C# Developer

.NET Developer

A .NET developer works with the .NET framework to build software applications. This course directly supports a career as a .NET developer by focusing on C# and .NET interview questions. A .NET developer's knowledge of the SOLID principles and common design patterns will allow for the creation of scalable and maintainable systems. The course's coverage of generics, LINQ and extension methods will also help the .NET developer to write clean and efficient code.

See salaries and explore the career path for .NET Developer

Software Developer

A software developer designs, develops, and tests software applications. This course, with its focus on C# and .NET fundamentals, helps software developers solidify their understanding of essential concepts. Understanding the differences between value types and reference types, or the purpose of the 'sealed' modifier, helps a software developer write robust and efficient code. Furthermore, the coverage of SOLID principles and design patterns in this course prepares a prospective software developer to design more maintainable and scalable applications.

See salaries and explore the career path for Software Developer

Software Engineer

A software engineer applies engineering principles to the design, development, testing, and evaluation of software systems. This course helps software engineers strengthen their understanding of C# and .NET, which are crucial for building various software applications. Having a strong foundation in access modifiers, static keywords, and the differences between classes and structs helps a software engineer make informed design decisions. By covering SOLID principles and design patterns, the course prepares software engineers to build scalable and maintainable software.

See salaries and explore the career path for Software Engineer

Application Developer

An application developer specializes in creating software applications for various platforms. This course helps application developers enhance their understanding of C# and .NET. With topics such as exception handling, generics, and LINQ, application developers learn to build more robust and efficient applications. The course also covers subjects like the common language runtime and common intermediate language, which helps application developers to better understand how C# applications are deployed and executed.

See salaries and explore the career path for Application Developer

Web Developer

A web developer is involved in designing, coding, and maintaining websites and web applications. Mastering C# and .NET helps web developers gain the skills to develop dynamic and interactive web experiences. The course’s discussions of LINQ, generics, and extension methods give web developers the tools to write clean and maintainable code. By understanding topics like the garbage collector and nullable types, one is better equipped to tackle memory management and data handling within web applications.

See salaries and explore the career path for Web Developer

Full-Stack Developer

A full stack developer works on both the front end and back end of applications. This course helps full stack developers who use C# and .NET on the back end to strengthen their understanding of the language and framework. Working with C#, the full stack developer can leverage the topics discussed such as extension methods, IEnumerable, or even the differences between equality operators to create an efficient, scalable, and functional program.

See salaries and explore the career path for Full-Stack Developer

Backend Developer

A backend developer focuses on the server side of applications, including databases, servers, and APIs. This course may be useful for backend developers who use C# and .NET in their work. Knowing the nuances of generics, LINQ, and asynchronous programming helps backend developers to build scalable and efficient APIs. Also, the course’s look at the nuances of the garbage collector and nullable types, gives backend developers the capacity to better manage data.

See salaries and explore the career path for Backend Developer

Test Automation Engineer

A test automation engineer designs and implements automated tests to ensure software quality. This course helps test automation engineers who work with C# and .NET to strengthen their understanding of the language and framework. Knowing the intricacies of C# and .NET helps in writing more effective and robust automated tests. Test automation engineers are in charge of writing testing scripts, and having a full, deep understanding of the nuances of C# will only make those scripts more effective.

See salaries and explore the career path for Test Automation Engineer

Technical Lead

A technical lead oversees a team of developers and guides technical decisions. This course may provide value to technical leads who are proficient in C# and .NET. Knowing common interview questions helps a technical lead evaluate the skills of potential team members. In addition, understanding the nuanced topics in this course, the technical lead can guide their team in making architectural decisions and in ensuring the team follows best practices in the .NET ecosystem.

See salaries and explore the career path for Technical Lead

Software Architect

A software architect designs the high-level structure of software systems. This course may benefit software architects who work with C# and .NET. Having a thorough understanding of C# and .NET fundamentals, including SOLID principles and design patterns, helps the software architect make informed decisions about system design. The coverage of topics like generics, LINQ, and asynchronous programming may inform architects in the selection of the proper patterns and approaches.

See salaries and explore the career path for Software Architect

DevOps Engineer

A DevOps engineer focuses on automating and streamlining the software development lifecycle. This course may offer value to DevOps engineers who work with C# and .NET applications. Knowing the relationship between C# and .NET, what CLR is, and even how to handle exceptions will help to ensure that the developer has a full and robust ecosystem. The course helps the DevOps engineer better understand the technologies that are being deployed and maintained.

See salaries and explore the career path for DevOps Engineer

Database Developer

A database developer designs, implements, and maintains databases. This course may be useful to database developers who work with C# and .NET applications to access and manipulate data. Topics such as LINQ, generics, and nullable types are valuable in database interactions. The insights into the nuances of the garbage collector and nullable types can help database developers optimize data access and management within .NET applications.

See salaries and explore the career path for Database Developer

Data Scientist

A data scientist analyzes data to extract meaningful insights and develop data-driven solutions. While typically data scientists do not use C#, those who wish to create applications that implement machine learning models or statistical analysis might find this course helpful. The .NET framework has libraries that can be leveraged in statistical modeling. Knowing C# allows a data scientist to create more efficient and optimized code.

See salaries and explore the career path for Data Scientist

IT Manager

An Information Technology manager oversees a company's technological infrastructure and resources. This course may be useful for IT Managers, because if they have a deeper understanding of the languages and frameworks being used at their organization, they will be better equipped to manage those resources. The .NET framework is still widely used and supported by the IT community.

See salaries and explore the career path for IT Manager

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in C#/.NET - 50 Essential Interview Questions (Junior Level).

Windows Runtime via C#

Save

CLR via C# provides an in-depth look at the Common Language Runtime (CLR), the foundation of the .NET Framework. is highly valuable for understanding the underlying mechanisms of C# and .NET, which can help you answer tricky interview questions. It is commonly used as a reference by industry professionals. Reading this book will give you a deeper understanding of how C# code is executed and managed.

Windows Runtime via C# (Developer Reference)

Kindle Edition

Design Patterns

Save

This classic book introduces fundamental design patterns that are widely used in software development. It provides a comprehensive overview of various patterns, their intent, and their implementation. While it's not specific to C#, the concepts are applicable and essential for any object-oriented programmer. is more valuable as additional reading to broaden your understanding of software design.

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

What's inside

Learning objectives

Syllabus

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Activities

Career center

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