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Tip of the Day
Language: VB4,VB5,VB6
Expertise: beginner
Apr 27, 1999

Don't test auto-instancing variables using Is Nothing

You can't reliably test an auto-instancing object variable using the Is Nothing test, because as soon as you reference the variable Visual Basic silently creates an object of the given class, and the test always returns False:


Dim x As New MyClass
If x Is Nothing Then
  ' this line will be never executed
End If
Francesco Balena
 
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