OOP Concepts in C#

Object-Oriented Programming (OOP) is a programming approach that organizes code using objects and classes. C# is a fully object-oriented language.

OOP helps in building reusable, scalable, and easy-to-maintain applications.

Main OOP Concepts

• Class
• Object
• Encapsulation
• Inheritance
• Polymorphism
• Abstraction

1. Class

A class is a blueprint used to create objects. It defines properties (data) and methods (behavior).

class Person
{
    public string Name;
    public int Age;

    public void Show()
    {
        Console.WriteLine(Name + " " + Age);
    }
}
    

2. Object

An object is an instance of a class.

Person p1 = new Person();
p1.Name = "Rahul";
p1.Age = 25;
p1.Show();
    

3. Encapsulation

Encapsulation means wrapping data and methods together and restricting direct access using access modifiers.

class Student
{
    private int marks;

    public void SetMarks(int m)
    {
        marks = m;
    }

    public int GetMarks()
    {
        return marks;
    }
}
    

4. Inheritance

Inheritance allows a class to acquire properties and methods of another class using :.

class Animal
{
    public void Eat()
    {
        Console.WriteLine("Eating...");
    }
}

class Dog : Animal
{
    public void Bark()
    {
        Console.WriteLine("Barking...");
    }
}
    

5. Polymorphism

Polymorphism means "many forms". It allows methods to behave differently based on the object.

class Shape
{
    public virtual void Draw()
    {
        Console.WriteLine("Drawing shape");
    }
}

class Circle : Shape
{
    public override void Draw()
    {
        Console.WriteLine("Drawing circle");
    }
}
    

6. Abstraction

Abstraction hides implementation details and shows only essential features using abstract classes or interfaces.

abstract class Vehicle
{
    public abstract void Start();
}

class Car : Vehicle
{
    public override void Start()
    {
        Console.WriteLine("Car started");
    }
}
    

Key Points

• OOP improves code reusability
• Encapsulation provides data security
• Inheritance supports code reuse
• Polymorphism increases flexibility
• Abstraction reduces complexity

Conclusion

OOP concepts form the backbone of C# programming. Understanding these concepts is essential for developing real-world applications.

C# OOP Quiz