C# Tutorial & Reference Projects

This repository contains a comprehensive collection of C# tutorials and reference implementations, designed to demonstrate core C# concepts, Object-Oriented Programming (OOP) principles, and modern .NET development practices.

The solution has been upgraded to .NET 10.0 and refactored to follow professional coding standards and English naming conventions.

Project Structure & Content

The solution consists of multiple isolated console and Windows Forms applications, each focusing on specific topics:

Core Concepts

• TypesAndVariables: Introduction to value types, reference types, and variable declarations.
• Conditionals: Usage of if-else, switch-case blocks.
• Loops: Implementation of for, foreach, while, and do-while loops.
• Strings: String manipulation and common string methods.
• Arrays: Single and multi-dimensional arrays.
• Maths: Basic arithmetic operations and method definitions (FourOperations).

Object-Oriented Programming (OOP)

• Classes: Fundamentals of Classes, Properties, and Encapsulation.
• Methods, MethodsTwo, MethodOverloading: Deep dive into methods, ref/out keywords, params, and overloading.
• Constructors: Constructor injection and object initialization.
• Inheritance: Base classes, derived classes, and code reusability.
• Interfaces, InterfacesTwo, InterfacesDemo: Interface-driven design, polymorphism, and dependency management.
• AbstractClasses: Abstract methods and classes for defining templates.
• VirtualMethods: Overriding virtual methods for polymorphic behavior.
• AccessModifiers: public, private, protected, and internal modifiers.
• RecapDemo: Review of Logger implementation strategies (Database, File, SMS) using Interfaces.

Advanced Topics

• Generics, GenericsIntro, MyDictionary: Creating custom generic collections and repository patterns (IRepository<T>).
• Delegates: Function pointers, Action, Func.
• Events: Event-driven programming.
• Exceptions: Exception handling (try-catch) and creating custom exceptions.
• Attributes: Custom attributes and reflection usage.
• Reflection: Inspecting runtime type information.
• Collections: List, Dictionary, and legacy variable types.

Data Access & Real-World Simulations

• ObjectOrientedCore: Basic product management operations.
• CustomerManagementSystem: Corporate vs. Individual customer modeling using Inheritance/Polymorphism.
• CreditApplicationSystem: Credit Application System simulation (ICreditManager, ILoggerService) demonstrating Dependency Injection and loosely coupled design.
• GameProject: Simulation of a game sales platform with Gamer validation (e-Government), Promotions (Campaign), and Sales logic.
• AdoNetDemo: CRUD operations using pure ADO.NET and Microsoft.Data.SqlClient.
• EntityFrameworkDemo: CRUD operations using Entity Framework (ORM).

Technologies

• Runtime: .NET 10.0
• Language: C# 12 / 13
• Project Types: Console App, Windows Forms App
• Data Access: ADO.NET, Entity Framework (Legacy & Core concepts)

Getting Started

1. Prerequisites: Ensure you have the .NET 10 SDK installed.
2. Clone: Clone this repository.
3. Build: Run dotnet build in the root directory.
4. Run: Navigate to any project folder (e.g., cd OOP3) and run dotnet run (for Console apps).

Clean Code Principles

This repository emphasizes:

• SOLID Principles (Single Responsibility, Open/Closed, Dependency Inversion etc.)
• DRY (Don't Repeat Yourself)
• Clean Naming (English PascalCase/camelCase)