Re: Ensure only one instance running

Here's what I use.


private static Mutex _mutex;

....

string mutexName = "RUNMEONLYONCE";
try {
 _mutex = Mutex.OpenExisting(mutexName);
 _mutex.Close();
 MessageBox.Show("Only one instance of this application may be running at a
time.");
 return;
} catch (WaitHandleCannotBeOpenedException) {
 _mutex = new Mutex(false, mutexName);
}
I will prefix the name with "Local\..." from Peter's post.
I ran into that issue some time back but never was able to figure out
specifically how to prevent that from occurring.
Also, if anyone has any recommendations about this code I'm all ears.

Thanks,
Mike

On Dec 21, 2007 7:53 AM, Graeme Hood <[email protected]> wrote:

> I have this code to make sure my app can't run twice. But I seem to
> remember there was a newer/better way in the latest .Net FW.
>
> Is there?
>
> ====================================================
>
> public static void Main()
>
> bool firstInstance = false;
>
> string safeName = Application.UserAppDataPath.Replace(@"\", "_");
>
> Mutex mutex = new Mutex(true, safeName, out firstInstance);
>
> if (!firstInstance) return;
>
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