This book aims help you understand the Object Oriented approach to programming and help you develop some practical skills along the way. To this end each chapter will incorporate small exercises with solutions and feedback provided.

The concepts that will be explained and skills developed are in common use among programmers using many modern Object Oriented languages and are thus transferrable from one language to another. However for practical purposes these concepts are explored and demonstrated using the C# (pronounced C sharp) programming language.

This, the second edition of this book, has been written to demonstrate:
• How to apply Polymorphism and the SOLID design principles to create effective and robust Object Oriented systems.
• Why agile software engineering methods (e.g. Scrum, XP and TDD) are now preferred over older methods.
• How Object Orientated design supports the use of modern agile software development methods.