11
What is Object-Oriented Programming in C#?
Object-Oriented Programming (OOP) is a programming approach that organizes software around objects containing state and behavior.
C# Interview
OOP & Core C# Concepts
C# interview questions covering oop & core c# concepts.
10 Questions Filter by level
Interview questions
Open a question for the full answer, code and interview guidance.
12
What is a class in C#?
A class is a blueprint or user-defined reference type used to describe the data and behavior of objects.
13
What is an object in C#?
An object is an instance of a class. The class defines the structure and behavior, while the object represents a concrete runtime instance.
14
What is encapsulation in C#?
Encapsulation means protecting an object's internal state and exposing only the operations that external code should use.
15
What is abstraction in C#?
Abstraction means exposing essential functionality while hiding unnecessary implementation details.
16
What is inheritance in C#?
Inheritance allows a derived class to reuse and extend members defined by a base class.
17
What is polymorphism in C#?
Polymorphism allows code to work through a common type or contract while different concrete objects provide different behavior.
18
What is the difference between method overloading and method overriding?
Method overloading means defining multiple methods with the same name but different parameter lists. The compiler selects the appropriate overload based on the call.
19
What is an interface in C#?
An interface defines a contract that implementing types agree to provide.
20
What is an abstract class, and how is it different from an interface?
An abstract class is a class that cannot be instantiated directly and is intended to act as a base class. It can contain abstract members as well as fully implemented members, fields, properties, constructors, and protected state.