MultiTier Contact List

A simple Windows Forms application for managing contacts, built with a multi-tier architecture.

Features

• View all contacts in a data grid
• Add new contacts
• Update existing contacts
• Delete contacts
• Search contacts by ID

Architecture

The application follows a three-tier architecture:

1. Presentation Layer (UI) - Windows Forms
2. Business Logic Layer (BLL) - Contact class
3. Data Access Layer (DAL) - ContactDB and DatabaseConnection classes

Requirements

• .NET Framework 4.7.2
• SQL Server (local database)

Setup

1. Clone the repository
2. Open the solution in Visual Studio
3. Build and run the application

Usage

• Use the form fields to enter contact information
• Click the appropriate buttons to perform CRUD operations
• The data grid will automatically update to reflect changes