How can I prevent launching my app multiple times?

Question

I deployed my C# WinForms application using ClickOnce installation. Everything works fine with it (after a lot of work) :), but now I\'m facing a problem:

Whenever

Answer 1

what i always using is

bool checkSingleInstance()
    {
        string procName = Process.GetCurrentProcess().ProcessName;
        // get the list of all processes by that name

        Process[] processes = Process.GetProcessesByName(procName);

        if (processes.Length > 1)
        {

            return true;
        }
        else
        {
            return false;
        }
    }