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Mutex for one instance application

// October 29th, 2009 // Programming

If you want to create application that must be running only once (can’t duplicate). Mutex class in System.Threading namespace can help you to done this problem.

Here the sample of my code to control’s my program only run once, i need this cause i working on serial communication. But, you can use this for other purpose.

    static class Program
    {
        /// 

        /// The main entry point for the application.
        /// 
        ///
        public static string name = "SMSGrabApplication";
        public static Mutex mutex;

        [STAThread]
        static void Main()
        {
            if (!isMutexActive(name))
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new FormUtama());
            }
            else
            {
                Application.Exit();
            }

        }

        public static bool isMutexActive(string mutexName)
        {
            try
            {
                mutex = Mutex.OpenExisting(mutexName);
                return true;
            }
            catch (WaitHandleCannotBeOpenedException)
            {
                mutex = new Mutex(true, mutexName);
                return false;
            }
            catch (UnauthorizedAccessException)
            {
                return true;
            }
        }
    }

You need to release this Mutex before you close your application.

here my simple code :

   Program.mutex.ReleaseMutex();

Hope it’s help
Willy Achmat Fauzi