Program.cs

using System;
using System.Diagnostics;
using System.Security.Principal;
using System.Windows.Forms;
using FirewallPortManager.Forms;

namespace FirewallPortManager
{
    internal static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // Check if running as administrator
            if (!IsRunningAsAdministrator())
            {
                MessageBox.Show(
                    "Firewall Port Manager requires administrator privileges to manage Windows Firewall rules.\n\n" +
                    "Please run the application as administrator:\n" +
                    "1. Right-click on the application\n" +
                    "2. Select 'Run as administrator'\n\n" +
                    "The application will now exit.",
                    "Administrator Privileges Required",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Warning);
                
                // Try to restart as administrator
                var result = MessageBox.Show(
                    "Would you like to restart the application as administrator?",
                    "Restart as Administrator",
                    MessageBoxButtons.YesNo,
                    MessageBoxIcon.Question);
                
                if (result == DialogResult.Yes)
                {
                    try
                    {
                        var processInfo = new ProcessStartInfo
                        {
                            FileName = Application.ExecutablePath,
                            UseShellExecute = true,
                            Verb = "runas" // This requests elevation
                        };
                        Process.Start(processInfo);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(
                            "Failed to restart as administrator: " + ex.Message,
                            "Error",
                            MessageBoxButtons.OK,
                            MessageBoxIcon.Error);
                    }
                }
                
                return; // Exit current instance
            }

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainForm());
        }

        /// <summary>
        /// Checks if the current process is running with administrator privileges
        /// </summary>
        /// <returns>True if running as administrator, false otherwise</returns>
        private static bool IsRunningAsAdministrator()
        {
            try
            {
                var identity = WindowsIdentity.GetCurrent();
                var principal = new WindowsPrincipal(identity);
                return principal.IsInRole(WindowsBuiltInRole.Administrator);
            }
            catch
            {
                return false;
            }
        }
    }
}