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Tip of the Day
Language: Visual Basic
Expertise: Intermediate
Jul 19, 2001

Prevent Timer Re-Entry


When using a timer control, it is important to prevent re-entry. This occurs when the processing in the _Timer event takes long enough to still be executing when the next _Timer event fires. It is even possible for the execution of the second timer event to pass up that of the first. Depending on what the code does, re-entry can cause all sorts of hard-to-trace problems.

A simple solution is to disable the timer control during the timer event handler:
 
   Private Sub Timer1_Timer()
      Timer1.Enabled = False

      'rest of code goes here

      Timer1.Enabled = True
   End Sub
Chris McCann
 
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