Class to handle the case where you need a single instance of an application

SingleInstance.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;


/*  Usage:
///////////////////////////////////////////////////////////////
    static void Main (string[] args)
    {
        if (!SingleInstance.CreateInstance()) { return; }
    
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new FormMain());
    
        SingleInstance.DestroyInstance();
    }
*/


namespace App.Utils
{
    static class SingleInstance
    {
        static private Mutex mutex;
        static private string AssemblyGuid
        {
            get
            {
                object[] attributes = Assembly.GetEntryAssembly().GetCustomAttributes(typeof(System.Runtime.InteropServices.GuidAttribute), false);
                if (attributes.Length == 0)
                {
                    return String.Empty;
                }
                return ((System.Runtime.InteropServices.GuidAttribute)attributes[0]).Value;
            }
        }

        static public bool CreateInstance()
        {
            bool onlyInstance = false;
            string mutexName = String.Format("Local\\{0}", SingleInstance.AssemblyGuid);
            mutex = new Mutex(true, mutexName, out onlyInstance);
            return onlyInstance;
        }

        static public void DestroyInstance()
        {
            mutex.ReleaseMutex();
        }
    }
}