My app shows a modal MDI parent form, and creates a timer that ticks every
ten minutes to boot unresposive users at 3 in the morning. Below is a
simplified working example with no time check. My question is, is it OK to
use End or it is there a cleaner way to close the app? Keep in mind that I
want everything taken down, including any warning dialogue box shown from
the timer, and any others that happen to be still open in the MDI parent
itself - so frm.Close does not work.

TIA,
Bob

'---------------------------------
Module Main

   Private WithEvents tmr As Windows.Forms.Timer
   Private frm As Form

   Public Sub Main()
       tmr = New Timer
       tmr.Interval = 2000
       tmr.Enabled = True
       frm = New Form
       frm.WindowState = FormWindowState.Maximized
       frm.IsMdiContainer = True
       frm.ShowDialog()
   End Sub

   Private DoingMessage As Boolean

   Private Sub tmr_Tick(ByVal sender As Object, ByVal e As
System.EventArgs) Handles tmr.Tick
       If DoingMessage Then
           Beep()
           End
       Else
           Dim msg As String = "This application will now shut down for the
night."
           DoingMessage = True
           If MsgBox(msg, MsgBoxStyle.OKCancel) = MsgBoxResult.OK Then
               End
           End If
           DoingMessage = False
       End If
   End Sub

End Module