How can I check for a running process per user session?

Question

I have a .NET application that I only allow to run a single process at a time of, however that app is used on Citrix boxes from time to time, and as such, can be run by mult

Answer 1

Just stating the obvious - although Mutex is usually considered better solution, you can still solve the single-instance-per-session issue without Mutex - just test the SessionId as well.

    private static bool ApplicationIsAlreadyRunning()
    {
        var currentProcess = Process.GetCurrentProcess();
        var processes = Process.GetProcessesByName(currentProcess.ProcessName);

        // test if there's another process running in current session.
        var intTotalRunningInCurrentSession = processes.Count(prc => prc.SessionId == currentProcess.SessionId);

        return intTotalRunningInCurrentSession > 1;
    }

Source (no Linq)