private void timer1_Tick(object sender, EventArgs e)
{
Stopwatch time = new Stopwatch();
//elapsedTime = DateTime.Now - startTime;
//lblTime.Text = elapsedTime.ToString(@"hh\:mm\:ss");
DateTime Toc = Convert.ToDateTime(time.ET());
string tic = Convert.ToString(Toc - startTime);
lblTime.Text = tic;
}