WPF mutex for single app instance not working

Question

I\'m trying to use the mutex method for only allowing one instance of my app to run. That is - I only want a max of one instance for all users on a machine. I\'ve read throu

Answer 1

Here is my new code which has the answer provided by @Willem van Rumpt (and @OJ)...

public partial class App : Application
{
    private Mutex _instanceMutex = null;

    protected override void OnStartup(StartupEventArgs e)
    {
        // check that there is only one instance of the control panel running...
        bool createdNew;
        _instanceMutex = new Mutex(true, @"Global\ControlPanel", out createdNew);
        if (!createdNew)
        {
            _instanceMutex = null;
            Application.Current.Shutdown();
            return;
        }

        base.OnStartup(e);
    }

    protected override void OnExit(ExitEventArgs e)
    {          
        if(_instanceMutex != null)
            _instanceMutex.ReleaseMutex();
        base.OnExit(e);
    }
}