C#定时器的使用

Timer timer1;
        this.timer1.Interval = 1000;
        this.timer1.Tick += new System.EventHandler(this.timer1_Tick);

        private void timer1_Tick(object sender, EventArgs e)
        {
            ArrayList AutoTask = new ArrayList();           
            AutoTask.Add("8:30:00");
            AutoTask.Add("9:30:00");
            AutoTask.Add("10:30:00");
            AutoTask.Add("11:30:00");

            for (int n = 0; n < 4; n++)
            {
                if (dtAuto.ToLongTimeString().Equals(AutoTask[n]))
                {
                    MessageBox.Show("现在时间是" + AutoTask[n]);
                }
            }
        }