Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using Pharmacy_Management_Sysytem.Services;

namespace Pharmacy_Management_Sysytem
{
    /// <summary>
    /// Main entry point for the Pharmacy Management System application
    /// </summary>
    internal static class Program
    {
        /// <summary>
        /// Global service container for dependency injection
        /// </summary>
        public static IServiceContainer Services { get; private set; }

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            try
            {
                // Initialize service container
                Services = new ServiceContainer();

                // Test database connection
                if (!Services.DatabaseConnection.TestConnection())
                {
                    MessageBox.Show("Unable to connect to the database. Please check your connection settings.", 
                                  "Database Connection Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }

                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new signInForm());
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Application startup error: {ex.Message}", 
                              "Startup Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}