Why on VB6 (Null = Null) is not logically True?
Please see http://img11.imageshack.us/img11/8053/34198907.jpg
(I just want to add some features to an old VB6 application I wrote few years ago.)
mark r
Favorite Answer
Null has no value so it isn't possible to compare Null with Null.
you need to use the IsNull() function to get a True/False check.
Note to people saying = means assignment here.
In VBA and almost certainly VB6 = is a test rather than assignment.
This is shown in a Microsoft example here:
http://msdn.microsoft.com/en-us/library/752y8abs(VS.80).aspx
In languages such as C++ == is used for equality tests but not in VB.
Anonymous
You used a single = operator which means you actually assigned the value of NULL to Null. Since NULL has no value, it returned False.
covinher
One = or two? Usually assignment evaluates to whatever you assigned from.
edit: screenshot says you're doing assignment, not comparison. That's your bug.