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#

## Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Declare two fields, `length` and `width` and implement a parameterized constructor which assigns parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `GetArea()` method which calculates and returns the area of the rectangle.


### Input
```C#
Calls the constructor by passing length and width
Calls the GetArea() method to return the area
```

### Output
```
Returns the area of a rectangle
```
### Sample Input

```C#
Rectangle obj = new Rectangle(2, 2);
```

### Sample Output
```C#
GetArea(); //Returns 4
```



# Problem Statement

You are given a partially completed code of a `Rectangle` class in the editor. Declare two fields, `length` and `width` and implement a parameterized constructor which assigns parameters to the `length` and `width` fields of the `Rectangle` class.
In the end, Implement the `GetArea()` method which calculates and returns the area of the rectangle.


## Input
```C#
Calls the constructor by passing length and width
Calls the GetArea() method to return the area
```

## Output
```
Returns the area of a rectangle
```
## Sample Input

```C#
Rectangle obj = new Rectangle(2, 2);
```

## Sample Output
```C#
GetArea(); //Returns 4
```



Can you implement a rectangle class using the concepts of encapsulation? A solution is placed in the "solution" section to help you, but we suggest you try to solve it on your own first.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Conclusion

Challenge 1: Implement the Rectangle Class

Problem Statement