Contacts Management System

A production-ready contact management system implementing clean 3-tier architecture with C# and SQL Server.

Architecture

┌─────────────────────────────────────────────┐
│    ConsoleApp-PresentationLayer            │  ← User Interface
├─────────────────────────────────────────────┤
│    ContactsBusinessLayer                   │  ← Business Logic
├─────────────────────────────────────────────┤
│    ContactsDataAccessLayer                 │  ← Data Persistence
└─────────────────────────────────────────────┘

Project Structure

contacts-management-system/
├── ConsoleApp-PresentationLayer/
│   ├── Program.cs
├── ContactsBusinessLayer/
│   ├── Contacts.cs
├── ContactsDataAccessLayer/
│   ├── ContactsDataAccess.cs
│   ├── Dataacces_Helper.cs

└── README.md

Features

• Clean Architecture: Strict separation of concerns
• SOLID Principles: Maintainable and extensible codebase
• Database Integration: Full CRUD operations with SQL Server
• Error Handling: Comprehensive exception management
• Scalable Design: Easy to extend and modify

Tech Stack

Layer	Technology
Presentation	C# Console Application
Business	C# Class Library
Data Access	ADO.NET + SQL Server
Development	Visual Studio 2022

Quick Start

# Clone the repository

git clone https://github.com/aboubakr-jelloulat/Dot-Net-Tiered-Architecture.git

# Open in Visual Studio
cd contacts-management-system
start ContactsManagementSystem.sln

# Build and run
dotnet build
dotnet run --project ConsoleApp-PresentationLayer

Dependencies

ConsoleApp-PresentationLayer
    │
    └── ContactsBusinessLayer
            │
            └── ContactsDataAccessLayer

Architecture Benefits

Benefit	Description
Maintainability	Single responsibility per layer
Testability	Independent layer testing
Scalability	Easy feature additions
Flexibility	Technology-agnostic design

Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit changes (git commit -m 'Add amazing feature')
4. Push to branch (git push origin feature/amazing-feature)
5. Open a Pull Request

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