16 C# Interview Questions to Practice (2024)

Whether you’re drawn to C# for its versatility, usability, or the ease with which you can transition to it from C++, C# is a powerful, effective programming language. Many types of programmers, especially Game Developers, commonly use it because of the speed and consistency it gives your coding.

Plus, not only is C# a fun and convenient language, but it can also net you a pretty impressive salary. C# Developers earn an average of $112,952 a year.

To land a six-figure C# job, you’ll have to perform well during the interview. Below, you’ll find some C# interview questions to practice, as well as their answers, so you can walk into your next interview with confidence.

1. What is C#?

C# is a programming language that’s object-oriented and type-safe. This means that the program will catch errors as you make them, preventing you from wasting time fixing minor problems later on.

It’s compiled with the .Net framework to generate Microsoft Intermediate Language (MSIL), which is a set of instructions that can run on multiple environments.

2. Can you execute more than one catch block?

No, you cannot execute multiple types of catch blocks. Once you’ve executed the proper catch code, the control gets transferred over to a final block. The code after that final block is what gets executed.

3. What are jagged arrays?

Jagged arrays have elements of tape arrays, and these can include different sizes and dimensions. They’re also referred to as arrays of arrays.

4. What’s the difference between void, public, and static?

If you have a public declared variable or method, it’ll be accessible anywhere inside the application. On the other hand, you can access static declared variables or methods without having to create an instance of a class. Void is different in that it’s a type modifier that says the variable or method doesn’t return a value.

5. What differentiates a constant from a read-only?

Constant variables get initialized and declared when it’s time to compile the code. After that, you can’t alter their values. Read-only refers to when you assign a value at run-time.

6. What’s an object?

An object refers to a class instance that allows you to access the methods pertaining to that class. If a class creates an object in memory, it’ll contain all of the information about the class’s variables, methods, and behavior.

7. What is a “using” statement in C#?

A “using” block is used to get a resource and process it but then dispose of it automatically after completing the block.

8. What do sealed classes refer to in C#?

Sealed classes are created when you want to restrict which class is going to get inherited. You’d use sealed modifiers to prevent deviation from a class. If you chose a sealed class to be a base class, you’d get a compile-time error.

9. What’s the difference between “out” and “ref” parameters?

An argument that’s passed as ref has to be initialized before it’s passed to the method. On the other hand, out parameters don’t have to be initialized before getting passed to a method.

10. What’s meant by method overloading?

Overloading refers to creating multiple methods that have the same name and unique signatures within the same class. During compilation, the compiler can use overload resolution to determine which method you need to invoke.

11. Describe the difference between array and arraylist

Items within an array have the same type. The size of an array is fixed. An arraylist is similar, except it doesn’t have a fixed size.

12. Are you able to use a “this” command within the context of a static method?

No, you cannot use a “this” command in a static method because you can only use static methods and variables in a static method.

13. What’s the accessibility modifier “protected internal”?

You can access protected internal methods and variables from within the same assembly. Also, you can access them from classes that have been derived from the parent class.

14. What’s meant by “serialization”?

Serialization refers to the process you use when you want to move an object through your network and have to convert it into a stream of bytes.

For an object to be eligible for serialization, it has to implement the ISerialize Interface. When you do the opposite operation — start with a stream of bytes and use it to create an object — you call the process de-serialization.

15. What’s the difference between System.Text.StringBuilder and System.String classes?

System.String isn’t mutable. As an immutable class, you can’t change its value without allocating new memory to the new value and releasing the previous allocation.

System.StringBuilder has a mutable string. This makes it possible to perform a variety of operations without having to allocate a separate memory location for the string you modified.

16. What’s the difference between System.Array.Clone() and System.Array.CopyTo()?

If you use Clone(), you create a fresh array object that has all the elements of the original array. When you use the CopyTo() technique, the elements of an existing array get copied into another existing array. With both methods, a shallow copy gets performed.

How to go beyond C# interview questions

Take your time and practice answering these questions to get ready to nail your next interview. If you still need a little help understanding the ins and outs of C#, check out our Learn C# course.

Depending on what role you’re applying for, your interview process may also include technical interviews, in which you’ll showcase your programming skills by completing coding challenges. Need help preparing for technical interviews? Check out our Career Center.

16 C# Interview Questions to Practice (2024)

FAQs

How to prepare for a C# coding interview? ›

Basic C# Coding Concepts and Interview Q&As
  1. Object-Oriented Programming (OOP) Concepts. Question: How would you explain the concept of encapsulation in C#? ...
  2. Delegates and Events. ...
  3. Value Types vs. ...
  4. Exception Handling. ...
  5. LINQ (Language Integrated Query) ...
  6. Asynchronous Programming. ...
  7. Dependency Injection. ...
  8. Multithreading.
May 30, 2024

How do you practice interview questions and answers? ›

Avoid memorizing answers : You don't need to memorize your answers word for word. Doing this can make you send robotic during your interview. Instead, try to make a bullet list of key talking points for each question and practice answering the questions in a way that sounds genuine and conversational.

What is class in C# interview questions? ›

Class is an entity that encapsulates all the properties of its objects and instances as a single unit. C# has four types of such classes: Static class: Static class, defined by the keyword 'static' does not allow inheritance. Therefore, you cannot create an object for a static class.

What is marshalling in .net mid to senior software interview? ›

Marshalling is the process of transforming types when they need to cross between managed and native code.

Is C# coding hard? ›

The C# language is also easy to learn because by learning a small subset of the language you can immediately start to write useful code. More advanced features can be learnt as you become more proficient, but you are not forced to learn them to get up and running. C# is very good at encapsulating complexity.

Is C# for dummies good? ›

Reading "C# for Dummies" can certainly be a good first step in becoming a programmer in C#. It is a beginner-friendly book that can provide you with a solid foundation in the basics of C# programming.

What is the star method when interviewing? ›

STAR method interviewing 101. Use the STAR method to strengthen your recruitment strategy and interview questions. STAR is an acronym that stands for Situation, Task, Action, and Result.

Should you rehearse interview answers? ›

Yes, absolutely. If you want to end the process by securing a coveted job offer, you need to rehearse your lines. The most successful job seekers do prepare ruthlessly and rehearse as much as possible.

How can I learn interview answers fast? ›

Here are five ways to help you memorize information for your next interview:
  1. Use your learning style.
  2. Prepare.
  3. Write it out, repetitively.
  4. Use memory devices.
  5. Test yourself.
Feb 3, 2023

What is the main class in C#? ›

The Main method is the entry point of an executable program; it is where the program control starts and ends. Main must be declared inside a class or struct. The enclosing class can be static . Main must be static .

How to identify a class in C#? ›

The name of the class follows the class keyword. The name of the class must be a valid C# identifier name. The remainder of the definition is the class body, where the behavior and data are defined. Fields, properties, methods, and events on a class are collectively referred to as class members.

What is encapsulation in C#? ›

Encapsulation is defined as the wrapping up of data and information under a single unit. It is the mechanism that binds together the data and the functions that manipulate them. In a different way, encapsulation is a protective shield that prevents the data from being accessed by the code outside this shield.

What should a senior C# developer know? ›

Multithreading and concurrency

A good senior C# developer should gain expertise in managing concurrent execution using threads, tasks, locks, synchronization primitives, and parallel programming patterns. They should understand the challenges and techniques of writing thread-safe code.

How to prepare a .net interview? ›

Interview Preparation for . NET Developers
  1. Review the Job Description. Before the interview, review the job description and requirements carefully. ...
  2. Brush up on your Technical Skills. ...
  3. Research the Company. ...
  4. Prepare for Behavioral Questions. ...
  5. Practice your Interview Skills. ...
  6. Dress Professionally and arrive on time.
Mar 4, 2023

What is marshaling in C#? ›

What is Marshaling? Marshaling is the process of creating a bridge between managed code and unmanaged code; it is the homer that carries messages from the managed to the unmanaged environment and reverse. It is one of the core services offered by the CLR (Common Language Runtime).

How should I prepare for coding interviews? ›

How to prepare for a coding interview
  1. Review common technical terms. Coding encompasses a wide variety of programming languages , and each has its own set of terms and processes. ...
  2. Research the company. ...
  3. Prepare to share your projects. ...
  4. Have a mock interview.
6 days ago

Is it easy to code in C#? ›

The learning curve for C# is relatively low when compared to more complex languages like Java, although it's not quite as simple to learn as Python, the ultimate programming language for those who are brand new to the field.

How can I be good at C# programming? ›

  1. Introduction. ...
  2. Use Descriptive Naming Conventions. ...
  3. Leverage C# Properties Instead of Public Variables. ...
  4. Use 'Using' Statements for Resource Cleanup. ...
  5. Embrace Consistent Coding Standards. ...
  6. Always Handle Exceptions. ...
  7. Leverage the Power of LINQ. ...
  8. Embrace Object-Oriented Principles.
Aug 2, 2023

How to crack coding interviews easily? ›

How To Crack A Coding Interview?
  1. Review the job description. ...
  2. Research the organisation. ...
  3. Revise your resume. ...
  4. Research learning resources. ...
  5. Choose the programming language. ...
  6. Practice coding in writing. ...
  7. Learn to code for software and system designs. ...
  8. Review your work.
Sep 8, 2023

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