c# Single instance of an application on one machine

using System;

using System.Threading;

using System.Windows.Forms;

namespace MyApp

{

    static class Program

    {

        static Mutex _Mutex = null;

        [STAThread]

        static void Main()

        {

            bool myAppFirstInstance;

            _Mutex = new Mutex(true, "Global\\MyApp ", out myAppFirstInstance);

            if (myAppFirstInstance)

                Application.Run(new MainForm());

            else

                MessageBox.Show("There is already exists a running instance of this application",

                    "Warning",

                    MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);

        }

    }

}