How can I prevent launching my app multiple times?

Question

I deployed my C# WinForms application using ClickOnce installation. Everything works fine with it (after a lot of work) :), but now I\'m facing a problem:

Whenever

Answer 1

There are times **Mutex** is not working in some areas. Like using in console application. So I tried using WMI Query.

Try this and it will work.

        /// 

        /// The main entry point for the application.
        /// 
        [STAThread]
        static void Main()
        {
            if (!isStillRunning())
            {
               Application.Run(new Form1());
             }
             else {
                 MessageBox.Show("Previous process still running.",
                    "Application Halted", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                 Application.Exit();
             }      
        }

        //***Uses WMI Query
        static bool isStillRunning() {
            string processName = Process.GetCurrentProcess().MainModule.ModuleName;
            ManagementObjectSearcher mos = new ManagementObjectSearcher();
            mos.Query.QueryString = @"SELECT * FROM Win32_Process WHERE Name = '" + processName + @"'";
            if (mos.Get().Count > 1)
            {
               return true;
            }
            else
               return false;
        }

Hope it helps.