Top 5 Must-Know C# Interview Questions: Crack the Code!

Programming is a job with a great future. It offers job security, a competitive salary, flexible working hours, and many other amenities. 

That is why more and more people turn toward programming as their career choice. One of the most versatile and easy-to-use programming languages today is C#. 

If you are applying for a C# developer position, it is crucial to prepare for your interview as best as possible. Today we want to discuss why you should consider learning C# and the essential C# interview question.

Why is programming a good choice for a professional career?

We live in a time where remote work plays an important part. Companies are looking for experts all around the world. 

This line of work allows you that flexibility that you can work for a big company across the world while never leaving your house.

Furthermore, software applications and websites are always needed and will never go out of use. 

That is why programming is definitely on the list of the best business ideas. Even if you are working as a programmer, you can still open your own company and hire more programmers to grow the business.

Whether you are applying for a job or interviewing other applicants, these interview questions will help you. 

Like any other programming language, C# has a lot to offer, requiring constant improvement on the personal plan.

C# Interview Questions & Answers:

Q.1. Why is C# the perfect choice?

If working as a programmer is your dream job, knowing what programming languages are the most useful today is essential. C# is very popular because:

• It is easy to use
• C# has a large community of users, and it is accessible to everyone
• It has strict coding rules that prevent errors in typing
• Multiple platforms support it

Q.2. What is C#?

Even though this is a fundamental question, you should not allow yourself to be caught off-guard by not knowing its answer. 

It is an object-oriented programming language for developing desktop, online, and mobile applications. Interviewers often want to know how knowledgeable you are regarding general knowledge.

You can discuss why C# is applicable if you want to expand your answer. 

“Being an object-oriented programming language, it allows you to create modular, reusable code. It can run on multiple platforms, like Linux, Windows, and macOS. Furthermore, it easily integrates with .NET programming and has excellent memory management capabilities through the garbage collector”.

Also, make sure to explain that, with the garbage collector feature, you don't have to allocate and deallocate memory yourself. 

The program will do it for you. Once an object is done using the memory, the garbage collector will free it.

Q.3. What is the difference between a value type and a reference type?

Value types (int, float) are stored on the stack and contain actual values. On the other hand, reference types (string, array) are stored on the heap and contain a reference to data.

Additionally, stack and heap are two types of memory allocation. You should use the stack for local variables and function calls and the heap for dynamic memory allocation that happens during runtime. 

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Q.4. What is the difference between an interface and an abstract class?

An interface is a collection of abstract methods, events, and properties that define how a class should behave. 

An abstract class is only used as a base class for other classes and cannot be instantiated. 

It can store both abstract and non-abstract methods, while an interface may only contain method signatures and constants.

Understanding that you should use an interface to define a typical behavior, you may share between multiple classes is crucial. 

They are important because they allow code reusability and polymorphism.

Q.5. What are delegates in C#?

A delegate is a reference to a method. You can use it to define callback functions, event handlers, and various types of method references. 

Delegates are crucial for asynchronous and event programming and play a key role in C#. However, because of its importance, it might be a basic C# interview question you overlook studying for. 

Per experts from Movers Development, if you want to succeed as a professional programmer and build fantastic websites and applications, you need to understand delegates and why they are so valuable for C#.

Q.6. What is LINQ, and why is it useful?

LINQ, or Language Integrated Query, represents a set of various language extensions. You can use it to query data from different sources, like a database, XML, collections, and so on. 

It uses a simple syntax that is not too complicated to understand.

This is a crucial skill to have if you want to work in an environment that relies on data processing, working with databases and various data formats.

How to prepare for an interview?

When it comes to studying for a programmer interview, that may include long hours. You may expect a Q&A section and a practical exam. Be sure to cover all the necessary topics and know your basics.

Studying for an interview also depends on the job position. If you are applying for a senior programmer position, you want to also use your previous experience to explain why you are the perfect fit for the job.

Remember to pace yourself and plan breaks to relax. This is an integral part because you don't want to overwork yourself. 

Have a good night's sleep before the interview, and trust your knowledge. 

Having confidence is also vital because programming requires immense resourcefulness and the ability to solve tasks independently.

C# interview question: Wrap Up!

We hope you are prepared to tackle the fundamental C# interview question. 

Remember that we have just scratched the surface of learning C#. Make sure to thoroughly understand all the terminologies before going to the interview. 

You should sound professional and knowledgeable. Best of luck in landing the best job of your dreams!