Gain insights into OOP with C#. Delve into practical coding examples and exercises, exploring OOP concepts through a real-world vending machine project to understand and apply them effectively.

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Object-oriented programming (OOP) has been around for decades. As the original object-oriented language, C# is a mainstay in the world of computer programming.

All the concepts of object-oriented programming that C# developers love to have in their arsenal are explained in detail along with relevant coding examples and exercises in this course.

This course is unique in its nature as it follows a project-based learning approach. Throughout the course, a real-world example of vending machine is followed to help the learners develop a firm understanding of the stated OOP concepts.

The learners will not only be able to play around with the project,  they’ll also be able to see all the concepts in action in this project.

Learn Object-Oriented Programming in C#

Let's move a step further and implement polymorphism using the example discussed in the previous lesson.

## Example
Consider the example of a `Product` class, which is the base class. Extending from this base class are the derived classes *Beverages and Chocolates*. These classes contain the **GetPrice()** method that calculates the selling price for the respective product.
### `virtual` and `override` Keywords
We already have discussed what we need our **GetPrice()**  method to do.

To achieve this, we need the parent class to allow the re-implementation of this inherited method. The base class allows this by using the keyword `virtual` in its method signature like this:
```c#
public virtual double GetPrice(){...}
```
On the other hand, when the derived class re-implements this inherited method, it will let the compiler know that I'm overriding the inherited method by using the `override` keyword  in its method signature like this:
```c#
public override double GetPrice(){...}
```
Don't worry too much about the method overriding concept at this point as we are going to discuss it thoroughly in the next lesson.

In this lesson, we will be implementing polymorphism using inheritance principles.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Polymorphism Using Inheritance

Example

`virtual` and `override` Keywords

Polymorphism Using Inheritance

Example

virtual and override Keywords

`virtual` and `override` Keywords