Chapter 3: 🧠 Object-Oriented and Advanced C#

Object-oriented programming lets you model domain concepts as types with behavior and invariants. In modern C#, OOP interoperates with functional patterns—records, LINQ, and async—so you can choose the best tool per problem.

Prerequisites: Chapters 1–2 (syntax, collections, methods, basic error handling).

Series

• Series 9: Introduction to Object-Oriented Programming (OOP) in C# — classes, structs, encapsulation.
• Series 10: Advanced OOP Concepts in C# — inheritance, polymorphism, interfaces, abstract types.
• Series 11: Delegates, Events, and LINQ — first-class functions, .NET events, querying collections.
• Series 12: Asynchronous Programming with async/await — Task, concurrency-friendly application code.

How to read this chapter

Build small class libraries as you go—models for invoices, game entities, or configuration—and keep console apps thin so you practice testing seams in Chapter 6.

Continue to Chapter 4: Introduction to Web Development with ASP.NET Core when you can comfortably define interfaces and async APIs.