C# Winform程序防止多开

            bool isAppRunning = false;
            Mutex mutex = new Mutex(true, System.Diagnostics.Process.GetCurrentProcess().ProcessName, out isAppRunning);
            if (!isAppRunning)
            {
            MessageBox.Show("程序已运行，不能再次打开！");
            Environment.Exit(1);
            }
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frm_Main());