protected void Button3_Click(object sender, EventArgs e) { MyTime myTime = new MyTime(); Label3.Text = string.Empty; for (int i = 0; i < 10; i++) { Label3.Text += String.Format("{0:HH:mm:ss:fffff} » {1:HH:mm:ss:fffff}<br /> ", DateTime.Now, myTime.Get()); Thread.Sleep(600); } }