Private Sub timer_clock_Tick(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles timer_clock.Tick
 
        tb_time.Text = zeit.Minutes.ToString("00") & ":" & _
                  zeit.Seconds.ToString("00") & "." & _
                  zeit.Milliseconds.ToString("00")
        With sw.Elapsed
            tb_time.Text = String.Format("{0:00}:{1:00}.{2:00}", .Minutes, _
              .Seconds, _
              .Milliseconds \ 10)
        End With
    End Sub
Private Sub cmd_stop_Click(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles cmd_stop.Click
        sw.Stop()
        tb_summarytime.Text = tb_time.Text
    End Sub