private void start_form_Load_1(object sender, EventArgs e)
{
System.Timers.Timer timerClock = new System.Timers.Timer();
timerClock.Elapsed += new ElapsedEventHandler(OnTimer);
timerClock.Interval = 1000;
timerClock.Enabled = true;
}
public void timer1_Tick(object sender, EventArgs e)
{
label5.Text = DateTime.Now.ToString();
}