Introduction

How do people write software that is still maintainable even after many decades? What is the best way to model software around real-world concepts? The answer to both questions is Object Oriented Programming (OOP). OOP is a widely used paradigm in professional programming and is especially useful in enterprise settings.

OOP can be thought of as a bridge that connects real-world concepts and source code. A cat, for example, has certain defining properties, such as age, fur color, eye color, and name. The weather can be described using factors such as temperature and humidity. Both of these are real-world concepts that humans have identified and defined over time. In OOP, classes are what help in defining the logic of a program. When assigning concrete values to the properties of these classes, the result is an object. For example, using OOP, you can define a class for representing a room in a house, and then assign values to its properties (color and area) to create an object of that class.

In Chapter 1, Hello C#, you learned how to use C# to write basic programs. In this chapter, you will see how you can design your code by implementing OOP concepts and using C# at its best.