Single instance windows forms application and how to get reference on it?

Question

I have a Windows Forms application that allows only one instance to be running at the time. I have implemented Singleton by using Mutex. The Application must be startable fr

Answer 1

Is this not over complicating things ? Rather than closing the existing instance and starting a new one, can you not just re-activate the existing instance? Either way round the code below should give you some ideas on how to go about it...?

Process thisProcess = Process.GetCurrentProcess();
        Process[] allProcesses = Process.GetProcessesByName(thisProcess.ProcessName);
        Process otherProcess = null;
        foreach (Process p in allProcesses )
        {
            if ((p.Id != thisProcess.Id) && (p.MainModule.FileName == thisProcess.MainModule.FileName))
            {
                otherProcess = p;
                break;
            }
        }

       if (otherProcess != null)
       {
           //note IntPtr expected by API calls.
           IntPtr hWnd = otherProcess.MainWindowHandle;
           //restore if minimized
           ShowWindow(hWnd ,1);
           //bring to the front
           SetForegroundWindow (hWnd);
       }
        else
        {
            //run your app here
        }

There is another question about this here