c# single instance running

 ///  <summary> 
        ///   Single instance runner
         ///  </summary> 
        static  void SingleInstanceRun()
        {
            bool isAppRunning = false;
            Mutex mutex = new Mutex(true, Process.GetCurrentProcess().ProcessName, out isAppRunning);
            if (!isAppRunning)
            {
                MessageBox.Show( " [Easy Order] is already running! " , " Prompt " , MessageBoxButtons.OK, MessageBoxIcon.Information);
                Application.Exit();
            }
            else
            {
                Start();
            }
        }