AutoGuard - The easy way to login

AutoGuard.cs

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using SteamAuth;
using Microsoft.VisualBasic;
using Timer = System.Threading.Timer;
using System.Drawing;

namespace AutoGuard
{
    class Program
    {
        private static IntPtr hwnd = IntPtr.Zero;
        private static string sharedSecret;

        [DllImport("user32.dll", SetLastError = true)]
        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("user32.dll", SetLastError = false)]
        static extern bool SetForegroundWindow(IntPtr hwnd);

        static void Main(string[] args)
        {
            Config();
        }

        private static void Config()
        {
            if(string.IsNullOrWhiteSpace(Properties.Settings.Default.shared_secret))
            {
                string input;
                input = Interaction.InputBox("Please enter the shared_secret", "AutoGuard - Configuration");

                if (string.IsNullOrWhiteSpace(input)) return;

                Properties.Settings.Default["shared_secret"] = input;
                Properties.Settings.Default.Save();
            }

            sharedSecret = Properties.Settings.Default.shared_secret;

            bool created;
            var waitHandle = new EventWaitHandle(false, EventResetMode.AutoReset, "HandleDie", out created);
            bool signaled;

            // Another instance of this process was already running.
            // We will kill it now
            if(!created)
            {
                Console.WriteLine("[Info] - Autoguard already running. Killing other instance!");
                waitHandle.Set();
                Console.WriteLine("[Ok] - Process Killed!");
            }

            var timer = new Timer(Tick, null, TimeSpan.Zero, TimeSpan.FromSeconds(5));

            NotifyIcon notifyIcon = new NotifyIcon();
            notifyIcon.Visible = true;
            notifyIcon.Icon = SystemIcons.Application;
            notifyIcon.BalloonTipText = "I am now running in the background";
            notifyIcon.BalloonTipTitle = "Auto Guard";

            notifyIcon.ShowBalloonTip(5000);
            notifyIcon.Dispose();

            do
            {
                signaled = waitHandle.WaitOne(TimeSpan.FromSeconds(5));
            } while (!signaled);

            Console.WriteLine("I will die now.");
        }

        private static void Tick(object state)
        {
            hwnd = FindWindow("vguiPopupWindow", "Steam Guard - Computerautorisierung erforderlich");

            if (hwnd != IntPtr.Zero)
            {
                SetForegroundWindow(hwnd);
                Thread.Sleep(1000);
                Trigger();
            }
        }

        private static void Trigger()
        {
            SteamGuardAccount sgAccount = new SteamGuardAccount();
            sgAccount.SharedSecret = sharedSecret;
            var auth = sgAccount.GenerateSteamGuardCode();
            

            SendKeys.SendWait(auth);
            SendKeys.SendWait("{ENTER}");
        }
    }
}