Prevent showing more then one application instance C# WinForms

Hi to all of you who came to my blog and use this info's that I wrote.
After some time spent with Android development and Java programming language I am back :)

I had one interesting business project that I was done in C# for an big Bosnian Company .
In this project I needed to prevent starting more instances of my application.
I done this before, but with some others techniques. In this case I use:

1- we need to create one class in our project

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace ORI2010
{
   // this class just wraps some Win32 stuff that we're going to use
   internal class NativeMethods
   {
   public const int HWND_BROADCAST = 0xffff;
   public static readonly int WM_SHOWME = RegisterWindowMessage("WM_SHOWME");
   [DllImport("user32")]
   public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
   [DllImport("user32")]
   public static extern int RegisterWindowMessage(string message);
   }
}

2- in Program.cs file in our WinForm project we need to put this code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Threading;
using System.Runtime.InteropServices;
using ORI2010;

namespace Invlidi
{
   static class Program
   {
        static Mutex mutex = new Mutex(true, "{8F6F0AC4-B9A1-45fd-A8CF-72F04E6BDE8F}");
   [STAThread]
   static void Main()
   {
   if (mutex.WaitOne(TimeSpan.Zero, true))
   {
   Application.EnableVisualStyles();
   Application.SetCompatibleTextRenderingDefault(false);
   Application.Run(new Form1());
   mutex.ReleaseMutex();
   }
   else
   {
   // send our Win32 message to make the currently running instance
   // jump on top of all the other windows
   NativeMethods.PostMessage(
   (IntPtr)NativeMethods.HWND_BROADCAST,
   NativeMethods.WM_SHOWME,
   IntPtr.Zero,
   IntPtr.Zero);
   }
   }

   }
}

3- finally in our first and main app form we put this code:

   protected override void WndProc(ref Message m)
   {
   if (m.Msg == NativeMethods.WM_SHOWME)
   {
   ShowMe();
   }
   base.WndProc(ref m);
   }
   private void ShowMe()
   {
   if (WindowState == FormWindowState.Minimized)
   {
   WindowState = FormWindowState.Normal;
   }
   // get our current "TopMost" value (ours will always be false though)
   bool top = TopMost;
   // make our form jump to the top of everything
   TopMost = true;
   // set it back to whatever it was
   TopMost = top;
   }

Yes, it is simple as you see. Until new post about Microsoft technology hello from me and my new friend Android :)