In this course, key concepts will be covered by learning how large programs are constructed, and how to use C# to perform object-oriented programming. Throughout the course, I will explore the many features of C# that support object-oriented programming, including objects, classes, inheritance, interfaces, and generic types. To make easier to learn a real-world context to these concepts, I will demonstrate how to use these features by writing real-world example code.

What you will learn

1. How to design application with objects

• How to represent entities in the system with software objects

• The object holds data and it also does things for us.

• Design a system by deciding what objects are required, what data they must store and what they need to do for us.

2. Protecting Data in the Class

• Protect the data fields in the class using private access modifier to allow only code running inside the object can access it.

3. Accessor and Mutator methods

• How to write a method which provides read access to the data field inside the object which is called get method

• Accessor methods return a value of some kind.

• Mutator method allows to change(mutate) a data field (sometimes called a set method)

4. Testing

• All the behaviours (class methods) need to be tested, particularly in terms of their error conditions.

• Whenever we create a behaviour, we should also create tests for that behaviour. So, we will create a test for each behaviour.

• Learn how to use unit testing to test all the behaviours of the classes using visual studio test framework.

5. Constructing Class Instances

• How to use constructor to get control at the point where a new object is created

• To make sure that a given system only contains object that are valid according to the Business Rules that apply to our solution.

6. How to Design Static Members

• Explaining static fields and methods

• Using the static members in the class.

7. Design with properties

• How to use properties to make to code clearer.

• How to make the code easier.

• The C# language provides properties to make getting and setting data easier.

8. Inheritance

• Using inheritance, one of the key concepts of OOP how to take the existing classes and reuse them by extending them.

• How to achieve code reuse by extending a parent class and making a child class

• Method can be marked as virtual so that they can be overridden by code in the child class. Using this how to create child classes with customised behaviours.

• How to reference to the parent class can refer to any of the child classes.

9. Abstract Classes

• How to consider the fundamental behaviours without worrying about individual details. This provide templates which can be filled in by specific child types. Design using interface as a contract by hiding the implementation details.