timer

        private System.Timers.Timer time;
        public Form1()
        {

            InitializeComponent();
            this.time = new System.Timers.Timer();
            this.time.Enabled = true;
            this.time.Interval = 100;
            time.Elapsed += new System.Timers.ElapsedEventHandler(start);
            time.Start();

        }

        public void start(object sender, System.Timers.ElapsedEventArgs  e)
        {
            if(DateTime.Now.Hour==15&&DateTime.Now.Minute==30)
            {
                time.Stop();
                MessageBox.Show("!!!");


            }
        }