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 MyClassIf x Is Nothing Then  ' this line will be never executedEnd If

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

Recent Articles: