Object-Oriented Programming with C# Roadmap

Stage	Main Topic	Content & Learning Activities	Objectives & Deliverables
1	C# Fundamentals	Syntax, Variables, Data Types Operators Control Flow Methods Arrays	Build a solid C# foundation.
2	Introduction to OOP	What is an Object? What is a Class? The Four Pillars of OOP	Understand the core concepts and benefits of OOP.
3	Classes and Objects	Defining a Class Creating Objects Properties Access Modifiers Static Members	Learn to create and use classes and objects.
4	Encapsulation	Data Hiding Using Properties Benefits of Encapsulation	Protect and manage access to object data.
5	Inheritance	The ':' Symbol The 'base' Keyword Virtual and Override The System.Object Class	Reuse and extend code through inheritance.
6	Polymorphism	Method Overloading Method Overriding Upcasting and Downcasting	Write flexible and adaptable code.
7	Abstraction	Abstract Class Interface Difference	Hide complexity and define contracts.
8	Advanced OOP Concepts	Structs vs. Classes Partial Classes Extension Methods Exception Handling	Explore advanced OOP features in C#.
9	Collections & LINQ	Understanding the Hierarchy Generics LINQ	Work effectively with collections of data.
10	SOLID Principles	SRP, OCP, LSP, ISP, DIP	Learn the principles of good object-oriented design.
11	Design Patterns	Introduction Creational, Structural, Behavioral Patterns	Apply proven solutions to common design problems.

Core Mindsets for C# OOP

1. Think in Objects, Not Scripts

Model your problem as a collection of interacting objects. Each object should have a clear responsibility, state (properties), and behavior (methods).

2. Build Black Boxes (Encapsulation)

Design classes that hide their internal complexity. Expose only what is necessary through well-defined properties and methods. This makes your code safer and easier to use.

3. Favor Composition over Inheritance

While inheritance is powerful, building complex objects by combining simpler ones (composition) often leads to more flexible and maintainable designs.

4. Design for Change

Embrace principles like SOLID. Write code that is open for extension but closed for modification. This makes your software adaptable to future requirements.