public Form1()
        {
            InitializeComponent();
        }

        private MemoryMappedFile mmf;

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                mmf = MemoryMappedFile.OpenExisting("COMMTEST");

                timer1.Start();
            }
            catch
            {
                MessageBox.Show("Applicazione principale non avviata", string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            Mutex mutex = Mutex.OpenExisting("testmutex");
            //mutex.WaitOne();

            using (MemoryMappedViewStream stream = mmf.CreateViewStream(1, 0))
            {
                BinaryReader reader = new BinaryReader(stream);
                double val = reader.ReadDouble();

                label1.Text = string.Format("{0}", val);
            }
        }