Code:
Private Sub btnStartStop_Click()
If Me.TimerInterval = 0 Then
StartTickCount = GetTickCount()
Me.TimerInterval = 15
Me!btnStartStop.Caption = "Stop"
Me!btnReset.Enabled = False
Else
TotalElapsedMilliSec = TotalElapsedMilliSec + _
(GetTickCount() - StartTickCount)
Me.TimerInterval = 0
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