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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Project

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#

# Abstract Methods
>An __abstract method__ is declared using the `abstract` keyword and does not have a body/ implementation.

There are certain rules we should follow when working with abstract methods. Let's have a look at these rules.

## Rules to be Followed</font>
* In contrast to a non-abstract/normal C# method, an *abstract method* does not have a body/definition, i.e., it only has a declaration or method signature.

* An *abstract method* can be declared inside an *abstract class* or an *interface* only, more on these later.

* To contain any *abstract method* in its implementation, a class has to be declared as an *abstract class*. *Non-abstract classes* **cannot** have abstract methods.

* An *abstract method* **cannot** be declared with the `private` or `sealed` modifier as it has to be implemented in some other class.

* *Abstract methods* are implicitly `virtual` so we cannot use the keyword `virtual` in their declaration.

> Just like abstract methods, an **abstract property** declaration does not provide an implementation of the property accessors, i.e.,  `get` and `set` blocks. It declares that the class supports properties but leaves the accessor implementation to derived classes.



## Declaration
Let's move on to the *syntax* part. Syntactically, the generalized declaration of an abstract method is as follows:

In this lesson, you'll get to know about abstract classes and methods.

Introduction to Object-Oriented Programming

Classes and Objects

Data Hiding

Inheritance

Polymorphism

Abstract Classes and Interfaces

Composition, Aggregation and Association

Abstract Classes and Methods