Object-Oriented Programming in C# by Example

Understand how real-world .NET applications are built — from syntax to architecture — by creating a complete RPG game step by step, with modern patterns and practices.

Description

Many developers entering the .NET ecosystem — especially those coming from other languages — struggle to understand large existing codebases. It’s hard to figure out how components relate, how layers interact, and what role design patterns, principles, and frameworks play in a real application.

This course is designed to bridge that gap.

In this hands-on training, you'll build a complete turn-based RPG game, evolving it from a simple console application into a modular, testable system with a Web API and a modern Blazor UI. Along the way, you’ll apply professional practices like object-oriented design, SOLID principles, layered architecture, dependency injection, domain modeling, and unit testing.

The goal is not to teach each of these technologies or patterns in depth — but to give you a working introduction to how they fit together in a real application. By building it yourself, you'll develop a clear understanding of what each piece does, why it exists, and how it connects with the rest.

By the end of this course, you will be able to look at an enterprise .NET solution and understand the big picture: where the business logic lives, how the application is structured, and how best practices are applied to keep the system maintainable and scalable.

Learning Goals

• Understand the syntax and structure of C# [Understand]
• Apply object-oriented programming principles in C# [Apply]
• Analyze the SOLID principles and their impact on maintainability [Analyze]
• Apply a layered architecture to structure code [Apply]
• Understand how to use Dependency Injection in .NET [Understand]
• Apply Entity Framework to access and manage data [Apply]
• Create and consume a RESTful Web API using ASP.NET Core [Create]
• Create interactive web UIs using Blazor Server [Create]
• Apply component-based design to structure a Blazor UI [Apply]
• Evaluate the architecture of a complete .NET solution [Evaluate]

Subjects

1. Introduction to C# and .NET
2. Setting up the development environment
3. Variables, conditionals, loops, and methods
4. Building a simple console RPG engine
5. Object-Oriented Programming in C#
6. Applying SOLID principles
7. Building layered architectures
8. Writing and organizing unit tests
9. Data access with Entity Framework
10. Introducing a Web API layer
11. Building a Blazor Server UI
12. Consuming APIs with HttpClient
13. UI architecture and componentization
14. Real-world practices: DI, DTOs, factories, services
15. Clean Architecture principles in action