Using timer control in a web form

I am beginner in VB.NET programming and need help in using timer control to display current time on my web form with in an accuracy of 1 second. I have put a timer control in design and making it enabled at run time on a button click. Setting a lable text in _Elapsed event of timer  to display the time. But it does not display anything. I have checked in debug mode that timer gets enabled but does not tgo to _Elapsed event. Any suggesttions ?
Private Sub ButMonitor_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButMonitor.Click
        DBConnect = Session("DBConnect")
        TmrScan.Interval = 1000
        TmrScan.Enabled = True  
End Sub

Private Sub TmrScan_Elapsed(ByVal sender As System.Object, ByVal e As System.Timers.ElapsedEventArgs) Handles TmrScan.Elapsed
        LblTime.Text = TimeOfDay
End Sub