VISUAL C# No.43 4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Threading;

namespace GuiMutex
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            string MutexName = "MediatutorialMutex";
            using (Mutex MutexKu = new Mutex(false, @"Global\" + MutexName))
            {
                if (!MutexKu.WaitOne(0, false))
                {
                    MessageBox.Show("Instance already running");
                    return;
                }

                GC.Collect(); //Garbage Collector
                Application.Run(new Form1());
            }

        }
    }
}