Learn C# OOP to write cleaner, modular, and scalable code by understanding classes in C#, working with objects in C#, and applying principles like data hiding, encapsulation, and inheritance.

Become a C# Programmer

This module provides an in-depth exploration of C# OOP (object-oriented programming), focusing on writing cleaner, more modular, and scalable code. We'll begin by covering the basics of classes in C# and objects in C# and progress toward advanced OOP concepts such as encapsulation, data hiding in C#, inheritance in C#, and polymorphism. Throughout, we’ll see how C# supports these OOP principles with its unique features to enhance development efficiency.

Object-Oriented Programming in C#

```c#
class ParentClass : class ChildClass{...}

```c#
class ChildClass :  class ParentClass {...}

```c#
class ChildClass : ParentClass {...}

Which one of the following is the generic syntax to derive a class from another class?

Which one of the following is the generic syntax to derive a class from another class?

A derived class can use all the fields and methods of the superclass directly which are: 

A derived class can use all the fields and methods of the superclass directly which are:

Subclass is not calling the parent class constructor

Superclass is not calling the subclass constructor

```C#
class A {
    
    int i;
    public A(int i)
    {
        this.i=i; 
    }
    
}
class B : A{
    
    int j;
    public B(int j)
    {
        this.j=j;
    }
    
}
```
The above code won't compile because:

<pre><code class="language-C#">class A {
 
 int i;
 public A(int i)
 {
 this.i=i; 
 }
 
}
class B : A{
 
 int j;
 public B(int j)
 {
 this.j=j;
 }
 
}
</code></pre>
The above code won’t compile because:

Any of the methods and fields can be called

The `base` keyword can be used to call any of the non-private _____.

The <code>base</code> keyword can be used to call any of the non-private _____.

Calls to constructors using `this( )` or `base( )` can be written:

Calls to constructors using <code>this( )</code> or <code>base( )</code> can be written:

Let's test your understanding of inheritance with the help of this short quiz.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Conclusion

Quiz