Ensure only one instance running

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;

This email message is intended only for the use of the named recipient.
Information contained in this email message and its attachments may be
privileged, confidential and protected from disclosure. If you are not the
intended recipient, please do not read, copy, use or disclose this
communication to others. Also please notify the sender by replying to this
message and then delete it from your system.