7 Common C# Interview Questions in 2022: Ace Your Next Interview

 

Getting hired as a programmer can be a challenge. There’s a lot of talent out there, and there’s a lot of competition. Many employers are wary of “paper programmers”; people who have no programming experience but just a degree. Because of this, they often ask in-depth programming questions during their interview. These questions can be hard to answer if you haven’t properly prepared. In this article, I’ll help you prepare to ace your next interview with these questions related to the C# programming language. At the same time, you might want to practice with some C# projects. These 50 essential C# questions and answers will help you understand the technical concepts of the language. You’ll walk into a meeting with the hiring manager with confidence. As a developer myself, I use these concepts daily.

 

Beginner C# Interview Questions and Answers

1. What is a class?

A class is a template to create an object. It contains properties as well as methods. We can create many instances of objects from a single class.

Below is an example of a class:

public class Student
    	{
        //data members
        public int rollNumber { get; set; }
        public string fullName { get; set; }

        //function
        public void PrintDetails()
        {
            //login of function
        }
 }

2. What are the main concepts of object-oriented programming?

Encapsulation, abstraction, polymorphism, and inheritance are the main concepts of object-oriented programming. Be prepared to describe each of these. Object-oriented programming differs from procedural programming insofar as procedural programming happens chronologically, step-by-step, whereas object-oriented programming is far more flexible.

3. What is an object?

An object is an instance of a class through which we access the functions of that class. We can use the “new” keyword to create an object. A class that creates an object in memory holds information about the functions, data members, and behavior of that class.

See the syntax of an object below.

//Class
    	public class Employee
    	{
        //private members
        private string fName { get; set; }
        private string lName { get; set; }

        //function
        public void Display()
        {
            Console.WriteLine("Full name is {0} {1}", fName, lName);
        }

        public void SetName(string firstName, string lastName)
        {
            fName = firstName;
            lName = lastName;
        }
    	}

    	class Program
    	{
        static void Main(string[] args)
        {
            //this is object
            Employee employee = new Employee();
            employee.SetName("John", "Grande");
            employee.Display();
        }
   	}

4. What is a constructor, and what are its different types?

A constructor is like a method with the same name as the class, but it is a unique method. Even if it is not created, the compiler creates a default constructor in memory at the time of creating an object of the class.

The constructor is used to initialize the object with some default values.

Default constructor, parameterized constructor, copy constructor, static constructor, and private constructor are all different constructor types.

Below are examples of different constructor types.

 

public class Student
    	{
        private int rollNumber { get; set; }
        private string fullName { get; set; }

        //default constructor
        public Student()
        {
            //code goes here
        }

        //parameterized constructor
        public Student(int rNum, string fName)
        {
            this.rollNumber = rNum;
            this.fullName = fName;
        }

        //static constructor
        static Student()
        {
            //code goes here
        }

        //copy constructor
        public Student(Student student)
        {
            rollNumber = student.rollNumber;
            fullName = student.fullName;
        }
 }
}

 class Purchase
	{
        //Syntax to write a destructor.
        ~Purchase()
        {
            //code here to release resources.
        }
}

5. Is C# code managed or unmanaged code?

C# is managed code because Common Language Runtime compiles the code to intermediate language code. C++ would provide examples of unmanaged code. Managed code simply refers to code that has its execution managed by the runtime.

6. What are value types and reference types?

We can categorize variables into value type and reference type. Variables of value type contain the value directly while a reference type variable contains the reference of the memory address where the value is stored actually in the memory.

Bool, byte, int, char, and decimal are value types.

String, class, delegates are reference types.