

Learn what kind of C# questions to expect at a technical interview, why they are asked, and how to prepare. We reached out to IT pros to help you out!
The problem with technical interviews is you never know if you should bring your lucky keyboard—
Or marker.
Not to mention the C# interview questions you’ll be asked are hardly predictable.
The good news?
We reached out to several C# experts to share their insights, and tell us what C# coding questions they like to ask to aspiring C# developers.
So, keep calm and read on.
This article will show you:
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Technical questions aren’t the only ones you’ll be asked during your interview. Learn how to nail all your interview questions from our guide: Common Job Interview Questions & Answers
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It’s no secret—
C# technical interviews usually consist of several stages.
Most of the time they start with C# phone interview questions.
The questions asked over the phone will be general coding questions, and because of the medium, focus on the more theoretical aspects of C#.
Marie Lamonde from DashThis says that potencial employees of her company are likely to be asked the following questions:
1. Do you have any C# experience?
2. What are your tips to write great C# code?
In fact—
Websites such as interviewing.io have been specifically created to help coders hone their skills before the actual interview takes place.
3. Which C# features do you like most and why?
In other words—
You can only become a great coder (and ace your C# interview questions along the way) if coding is something you’re truly passionate about.
4. Which C# structure would you use/do to get the fastest large objects manipulation and when/why would you care?
It stands to logic—
The basic C# interview questions to expect in the initial screening stage won’t really require you to do coding. You’re likely to be asked about your past experience, problems you encountered, solutions you arrived at, or business contexts in which you’ve had a chance to apply your C# coding skills, etc.
Moving on to on-site C# interview questions.
The good news?
Most companies allow you to show off your coding ability in a programming language of your choice. If you’re comfortable with C#, ask for C# coding questions.
The bad news?
You never know what to expect.
You will have heard the story of Max Howell, creator of Homebrew, being rejected by Google for not being able to invert a binary tree.
We reached out to several C# experts to pick their brains on what questions they like to challenge candidates with and why.
Dzmitry Valadziankou, Lead .NET Developer at ScienceSoft, has shared his experience on interviewing C# developers.
5. What will be the output of the following code snippet?
interfaceINamed
{
string Name { get;set; }
}
T[] q =new T[100];//where T some type
INamed named = q[10];
named.Name ="bob";
Console.WriteLine(q[10].Name ??"empty");
Console.ReadKey();
6. List<T> - what is the efficiency of Add method, RemoveAt method: Add – O(1)amortize, RemoveAt – O(n)
8. What is the difference between interface and abstract class?
The next set of questions comes from Somdip Dey, embedded A.I. Scientist at the University of Essex, UK. Here’s what he had to say:
8. Can you write the FizzBuzz program in C# now?
9. What are interfaces and abstract classes? And what are the differences between them? Can you give me an example?
10. What is LINQ in C#? Have you used it in your previous programs? Give me an example.
Finally—
Christine Orchard from Codementor sent us some of the most common C# interview questions that has been identified in a piece wrote for the Codementor community:
11. What makes your code really object-oriented?
12. What are the fundamental principles of OO programming?
13. What is the this Pointer?
14. What is the OO fundamental idea using C# that allows a data structure to perform operations on its own data?
15. What is Dynamic Dispatch?
16. Why do we still see so much non-OO code written in C# today?
17. How does OO simplify development?
18. How can we use the core concepts of OO in order to make this code easy to maintain and yet still flexible enough to cope with possibly ever-changing requirements?
19. How to avoid the NULL trap?
20. How to move to a State-related Codebase?
21. What is a state-related codebase?
If you don’t how to answer these C# advanced interview questions, check out the original article by Ed Freitas.
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3
It means one thing:
If you’re serious about your C# developer career:
You’ve got a lot to learn. And then some more.
Technical interviews are the stuff legends. Some say they’ve got nothing to do with real life, and while such radical statements are arguable, one thing is certain—
They’re notoriously hard and difficult to prepare for.
For example, your C# interview questions could just as well include questions about the entire tech stack C# is part of: .NET questions, ASP.NET questions, or Entity Framework.
In fact, the Devskiller Global Technical Hiring & Skills Report 2019 shows that programming languages are often tested with other technologies in their environment.
Plus—
There’s a whole thriving community of software engineers centered around helping coding newbies test their skills before the actual technical interview takes place. Check out:
To name only a few.
More than that: some companies, such as Palantir for example, publish their own guides on how to prepare for a technical interview. Google offers guidelines, too.
Remember—
Code as much as you can. If you run out of ideas for apps, visit HackerRank or TopCoder to just keep coding.
Plus, a great cover letter that matches your resume will give you an advantage over other candidates. You can write it in our cover letter builder here. Here's what it may look like:
See more cover letter templates and start writing.
Here’s a quick recap of all you need to know about C# interview questions:
Did you like the article? Do you have your own list of C# programming interview questions? Maybe you’d like to share some C# interview questions and answers? Give us a shout out in the comments below! We’d love to hear from you!
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