private void Form1_Load(object sender, EventArgs e)
    {
        // Create the delegate for the Timer type.
        System.Threading.TimerCallback timeCB = new System.Threading.TimerCallback(d);

        // Establish timer settings.
        System.Threading.Timer t = new System.Threading.Timer(
          timeCB,     // The TimerCallback delegate object.
          null,       // Any info to pass into the called method (null for no info).
          0,          // Amount of time to wait before starting (in milliseconds).
          1000);      // Interval of time between calls (in milliseconds).
    }

    void m(object o)
    {
        System.Media.SystemSounds.Hand.Play();
        SReminderEntities ctx = new SReminderEntities();

        var jobs = (from m in ctx.Messages
                    select m).ToList();

        var seljobs = from j in jobs
                      where j.RemindeTime.Date == DateTime.Now.Date
                            && j.RemindeTime.Hour == DateTime.Now.Hour
                            && j.RemindeTime.Minute == DateTime.Now.Minute
                      select j;

        foreach (var j in seljobs)
        {
           // SendGmail("iReminder", j.Text, new string[] { j.User.Email }, "iReminderSender@Gmail.com");
            //this.sendSMS(j.User.Mobile, j.Text);
            System.Media.SystemSounds.Hand.Play();
        }//foreach
    }

    void d(object o)
    {
        MessageBox.Show("Test");
    }

System.Threading.Timer t = System.Threading.Timer

private void Form1_Load(object sender, EventArgs e)
        {
            // Create the delegate for the Timer type.
            System.Threading.TimerCallback timeCB = new System.Threading.TimerCallback(d);

            // Establish timer settings.
              t = new System.Threading.Timer(
              timeCB,     // The TimerCallback delegate object.
              null,       // Any info to pass into the called method (null for no info).
              0,          // Amount of time to wait before starting (in milliseconds).
              1000);      // Interval of time between calls (in milliseconds).
        }

        void m(object o)
        {
            System.Media.SystemSounds.Hand.Play();
            SReminderEntities ctx = new SReminderEntities();

            var jobs = (from m in ctx.Messages
                        select m).ToList();

            var seljobs = from j in jobs
                          where j.RemindeTime.Date == DateTime.Now.Date
                                && j.RemindeTime.Hour == DateTime.Now.Hour
                                && j.RemindeTime.Minute == DateTime.Now.Minute
                          select j;

            foreach (var j in seljobs)
            {
               // SendGmail("iReminder", j.Text, new string[] { j.User.Email }, "iReminderSender@Gmail.com");
                //this.sendSMS(j.User.Mobile, j.Text);
                System.Media.SystemSounds.Hand.Play();
            }//foreach
        }