Focus App if Instance exist

Single Instance

taken from
https://stackoverflow.com/questions/5990118/maximize-window-from-the-main-function/32322918#32322918


 static class Program
    {
        private static volatile bool _exitProcess;

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            var showMeEventHandle = new EventWaitHandle(false, EventResetMode.AutoReset, "Idms-Kiosk", out var createdNew);

            if (createdNew)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                var form = new MainForm();

                new Thread(() =>
                {
                    while (!_exitProcess)
                    {
                        showMeEventHandle.WaitOne(-1);
                        if (!_exitProcess)
                        {
                            if (form.InvokeRequired)
                            {
                                form.BeginInvoke((MethodInvoker)form.BringFormToFront);
                            }
                            else
                            {
                                form.BringFormToFront();
                            }
                        }
                    }
                }).Start();

                Application.Run(form);
            }

            _exitProcess = true;
            showMeEventHandle.Set();
            showMeEventHandle.Close();
        }
    }


    public static class ExtMethods
    {
        public static void BringFormToFront(this Form form)
        {
            //form.WindowState = FormWindowState.Normal;
            form.ShowInTaskbar = true;
            form.Show();
            form.Activate();
        }
    }