Allow only one instance of C# application running

using System.Threading;

but the simplest and least intrusive one for me is:

Basically this is what I use in my Program.cs:

static System.Threading.Mutex s_mutex = null;

[STAThread] static void Main()

{

    bool instantiated;

    s_mutex = new System.Threading.Mutex(false, "Binglong.My.Application.Mutex", out instantiated);

    if (instantiated)

    {   // If instantiated is true, this is the first instance of the application

        Application.EnableVisualStyles();

        Application.SetCompatibleTextRenderingDefault(false);

        Application.Run(new MyApplicationForm());

    }

      else
            {
                MessageBox.Show("alreddy running");
            }

}