Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) _
  Handles Timer1.Tick
 
    TS = StoppUhr.Elapsed
 
    Label1.Text = Format(TS.Minutes, "00") & ":" & Format(TS.Seconds, "00") & _
      "." & Mid(Format(TS.Milliseconds, "000"), 1, 2)
 
End Sub

Gruß
Christoph