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

Welcome to the "C#/.NET - 50 Essential Interview Questions (Mid 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 50 popular C# interview questions. Each topic comes with several bonus questions, so we will learn the answers to 150 questions in total.

Check out the free video "What is the difference between string and StringBuilder?" with one of the most common questions from C# interviews.

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 "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.

You will not only learn to give the interviewer a satisfying answer to the question, but you will also gain a deep understanding of those topics, and become a better programmer. So even if you don't prepare for an interview at this moment, you will strengthen your coding skills and broaden your knowledge.

In this course theory and practice come together. A Git repository is included, and there you can find code for each of the lectures.

Although junior-level knowledge is required in this course, don't worry if you are not quite there yet. A free e-book is provided, and inside it, you will find detailed explanations of 15 junior-level topics you will need to know for this course. Also, another free e-book is included, with all lectures from this course gathered together.

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.

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 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.
Learn modern c# concepts: deconstruction, pattern matching and nullable reference types.
Two free e-books provided!
Get to know 5 popular design patterns.

Prepare for the 50 popular questions from c# technical interviews. 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.
Learn modern c# concepts: deconstruction, pattern matching and nullable reference types.
Two free e-books provided!
Get to know 5 popular design patterns.

Syllabus

How does the Garbage Collector decide which objects can be removed from memory?

Introduction

Welcome! (Basic information and how to get help)

C#, .NET and Visual Studio versions

Installing Visual Studio

Accessing the code - link to the repository

Accessing the code

What is the difference between Tuples and ValueTuples?

Quiz: What is the difference between Tuples and ValueTuples?

What is the difference between "is" and "as" keywords?

Quiz: How does the Garbage Collector decide which objects can be removed?

Quiz: What is the difference between "is" and "as" keywords?

What is the use of the “using” keyword?

Quiz: What is the use of the “using” keyword?

What is the purpose of the “dynamic” keyword?

What are generations?

Quiz: What is the purpose of the “dynamic” keyword?

What are expression-bodied members?

Quiz: What are expression-bodied members?

What are Funcs and lambda expressions?

Quiz: What are Funcs and lambda expressions?

What are delegates?

Quiz: What are generations?

Quiz: What are delegates?

What is the difference between Dispose and Finalize methods?

Quiz: What is serialization?

Quiz: What is the difference between Dispose and Finalize methods?

What are default implementations in interfaces?

Quiz: What are default implementations in interfaces?

What is deconstruction?

What is pattern matching?

Quiz: What is deconstruction?

Why is “catch(Exception)” almost always a bad idea (and when it is not?)?

Quiz: Why is “catch(Exception)” almost always a bad idea (and when it is not?)?

What is the difference between “throw” and “throw ex”?

Quiz: What is the difference between “throw” and “throw ex”?

What is the difference between typeof and GetType?

Quiz: What is pattern matching?

Quiz: What is the difference between typeof and GetType?

What is reflection?

Quiz: What is reflection?

What are attributes?

How does the binary number system work?

Quiz: What are attributes?

What is serialization?

Quiz: What is a List?

Quiz: How does the binary number system work?

What is the purpose of the “checked” keyword?

Quiz: What is the purpose of the “checked” keyword?

What is the difference between double and decimal?

What is an ArrayList?

Quiz: What is the difference between double and decimal?

What is an Array?

Quiz: What is a Dictionary?

Quiz: What is an Array?

What is a List?

Quiz: What is an ArrayList?

What is the purpose of the GetHashCode method?

Quiz: What is the purpose of the GetHashCode method?

What is a Dictionary?

What are indexers?

Quiz: What is caching?

Quiz: 28. What are indexers?

What is caching?

What are immutable types and what’s their purpose?

What are records and record structs?

Quiz: What are immutable types and what’s their purpose?

Quiz: What are records and record structs?

Why does string behave like a value type even though it is a reference type?

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 (Mid Level) with these activities:

Review C# Fundamentals

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Solidify your understanding of C# fundamentals to better grasp the interview questions and advanced topics covered in the course.

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Review basic syntax and data types.
Practice writing simple C# programs.
Study object-oriented programming concepts.

Read 'Design Patterns: Elements of Reusable Object-Oriented Software'

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Deepen your understanding of design patterns to better answer interview questions related to software design and architecture.

View Design Patterns on Amazon

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Read the chapters on the design patterns mentioned in the course.
Understand the intent, motivation, and structure of each pattern.
Identify opportunities to apply these patterns in your own code.

Read 'C# 8.0 and .NET Core 3.0 – Modern Cross-Platform Development'

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Expand your knowledge of modern C# and .NET Core to better understand the context of interview questions and demonstrate a broader understanding of the ecosystem.

View C# 8.0 and .NET Core 3.0 – Modern Cross... on Amazon

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Read the chapters on language features and .NET Core fundamentals.
Experiment with the code examples provided in the book.
Relate the book's content to the course's interview questions.

Four other activities

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Show all seven activities

Solve C# Coding Challenges on HackerRank

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Sharpen your C# coding skills by solving coding challenges on platforms like HackerRank to improve your problem-solving abilities and coding speed.

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Create an account on HackerRank.
Select C# as your preferred language.
Solve at least 5-10 C# coding challenges per week.

Create a C# Interview Question Cheat Sheet

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Consolidate your learning by creating a cheat sheet summarizing the key concepts and answers to common C# interview questions.

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Review the course materials and identify key concepts.
Summarize the answers to common interview questions.
Organize the cheat sheet for easy reference.

Participate in Mock C# Interview Sessions

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Simulate real interview scenarios by participating in mock interview sessions with peers to practice answering questions and receive feedback.

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Find a peer or group of peers to practice with.
Take turns asking and answering interview questions.
Provide constructive feedback to each other.

Build a Simple .NET Application

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Apply your knowledge by building a simple .NET application that utilizes the concepts covered in the course, such as LINQ, delegates, and asynchronous programming.

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Choose a simple application idea (e.g., a console-based task manager).
Design the application's architecture and features.
Implement the application using C# and .NET.
Test and debug the application thoroughly.

Career center

Learners who complete C#/.NET - 50 Essential Interview Questions (Mid 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 equips participants with the knowledge to confidently answer common interview questions. By covering topics ranging from low-level concepts like reflection to high-level matters like design patterns, this course builds a well-rounded understanding of C#. C# Developers benefit from the course's focus on modern C# features like deconstruction and nullable reference types. Furthermore, the practical code examples provided will help C# developers become proficient in applying these concepts in real-world scenarios. The course is an efficient way to strengthen your C# skills and broaden your knowledge base.

See salaries and explore the career path for C# Developer

Software Engineer

A Software Engineer applies engineering principles to the design, development, and testing of software systems. This course, centered around essential C# interview questions, helps build a strong foundation in C# and .NET. The detailed exploration of topics such as reflection, the dynamic keyword, and modern C# features, along with design principles and coding practices, helps Software Engineers create robust and scalable solutions. The included Git repository with code examples helps Software Engineers apply theoretical knowledge in practical scenarios. The course is an efficient way to deepen your knowledge of C# and become a more capable problem-solver.

See salaries and explore the career path for Software Engineer

Software Developer

A Software Developer designs, develops, and tests software applications. This course, which focuses on essential C# interview questions, can help developers solidify their understanding of core C# concepts. Mastery of topics like reflection, the dynamic keyword, and modern C# features such as pattern matching and nullable reference types are looked upon favorably. The course's exploration of design principles and coding practices further enhances a software developer's ability to write maintainable and efficient code. The included e-books and code examples help provide a comprehensive learning experience that reinforces theoretical knowledge with practical application, making aspiring Software Developers well-prepared for technical challenges.

See salaries and explore the career path for Software Developer

Technical Lead

A Technical Lead guides a team of developers and makes key technical decisions. This course will help current and aspiring Technical Leads in C# shops. It is taught by a C# Technical Lead, and it covers subjects that are relevant to interviewing and discerning the knowledge of potential candidates. The course's deep dive into C# topics, design principles, and coding practices equips a Technical Lead to mentor their team effectively and make informed architectural choices. In particular, the included resources offer practical insights and examples that a Technical Lead can use to improve team performance.

See salaries and explore the career path for Technical Lead

Application Developer

An Application Developer is responsible for designing, coding, and debugging applications. This course helps solidify their understanding of C# concepts. The course's coverage of topics such as reflection, the dynamic keyword, and modern C# features like pattern matching helps an Application Developer. The examination of design principles and coding practices in the course enhances an Application Developer's ability to write understandable code. The included e-books and code examples help teach theoretical knowledge with practical application, making aspiring Application Developers well-prepared for technical challenges.

See salaries and explore the career path for Application Developer

Backend Developer

A Backend Developer focuses on the server-side logic and databases that power applications. This course strengthens a Backend Developer's understanding of C# and .NET. The detailed coverage of topics like delegates, lambda expressions, and the Garbage Collector helps Backend Developers write efficient server-side code. The exploration of design principles and best coding practices will help Backend Developers build maintainable and scalable backend systems. In particular, the course can help a Backend Developer deepen their understanding of C# and .NET.

See salaries and explore the career path for Backend Developer

Software Architect

A Software Architect designs the structure and components of software systems. This course helps Software Architects deepen their understanding of C# and .NET. The discussions of design principles, coding practices, and modern C# features equips Software Architects with the knowledge to create scalable architectures. The course's coverage of topics like reflection and design patterns can help Software Architects make informed decisions about technology choices and system design. A Software Architect typically needs an advanced degree.

See salaries and explore the career path for Software Architect

Full-Stack Developer

A Full Stack Developer works on both the front-end and back-end of applications. This course enhances a developer's skills in C#, a crucial language for .NET backends. The course helps Full Stack Developers respond to job interview questions across the full stack. The coverage of topics like design patterns, coding practices, and modern C# features will improve a Full Stack Developer's versatility and problem-solving capabilities. The understanding of both front-end and back-end technologies makes a developer adept at handling diverse development tasks.

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

Test Automation Engineer

A Test Automation Engineer develops and maintains automated tests to ensure software quality. This course will help Test Automation Engineers working with C# based systems. A solid understanding of C# is essential for writing effective automated tests, particularly when working with .NET applications. The course strengthens their skills in C# fundamentals and advanced topics. The knowledge of best coding practices is applicable for writing maintainable test code. By understanding core C# principles, those in test automation will be more effective in their work.

See salaries and explore the career path for Test Automation Engineer

DevOps Engineer

A DevOps Engineer automates and streamlines the software development lifecycle. This course may be useful by deepening the knowledge of C# and .NET, which are often used in DevOps environments, particularly for automation scripting and infrastructure-as-code. The course's coverage of topics helps to write effective automation scripts. The understanding of coding practices will allow DevOps engineers to write code that integrates into existing systems. This can help in roles that require coding in C#.

See salaries and explore the career path for DevOps Engineer

Data Engineer

A Data Engineer designs, builds, and maintains data pipelines and infrastructure. This course may be useful because a foundational knowledge of C# can be beneficial when working with data-intensive applications, especially those built on the .NET framework. The course's coverage of core C# concepts and coding practices helps Data Engineers to write efficient and well-structured code for data processing tasks. This is particularly relevant when integrating data pipelines with .NET applications. Having a strong understanding of C# allows Data Engineers to work on a wider range of projects.

See salaries and explore the career path for Data Engineer

Database Administrator

A Database Administrator manages and maintains databases, ensuring data integrity and performance. This course may be useful because it covers .NET technologies, which are often integrated with databases in enterprise environments. The course's coverage of C# fundamentals can help Database Administrators better understand the applications that interact with databases. This understanding can aid in optimizing database performance and troubleshooting issues related to data access. This course provides a broader understanding of the technology stack.

See salaries and explore the career path for Database Administrator

IT Support Specialist

An IT Support Specialist provides technical assistance and troubleshooting for computer systems and software. This course may be useful because basic knowledge of C# and .NET can be helpful when troubleshooting software issues in .NET environments. The course's coverage of fundamental C# concepts and the .NET framework can help IT Support Specialists better understand the underlying technology of applications they support. This understanding can improve their ability to diagnose and resolve software-related problems, leading to more effective support.

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Technical Writer

A Technical Writer creates documentation for software and hardware products. This course may be useful because knowledge of C# and .NET could enable a more comprehensive understanding of the technology being documented. The course's coverage of C# fundamentals and .NET concepts could help Technical Writers create more accurate and informative documentation for developers and end-users. This helps bridge the gap between technical implementation and clear communication.

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Project Manager

A Project Manager plans, executes, and closes software development projects. This course: "C#/.NET - 50 Essential Interview Questions (Mid Level)" may be useful because knowledge of C# and .NET can help Project Managers better understand the technical aspects of software projects. The course's coverage of C# fundamentals and .NET concepts helps Project Managers better understand the tasks involved in the project. This is especially relevant when managing project schedules, and communicating with developers.

See salaries and explore the career path for Project Manager

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

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