3 replies to this topic

[wwarren]

Is there a difference (performance wise) between these two statements?

If x IsNot Nothing Then

    'Do Something

End If

and

If Not x Is Nothing Then

    'Do Something

End If

In VB.NET?

[fayyazlodhi]

Generally speaking (applying to all languages), !(Expression) is a u nary operator whose evaluation should be faster than a binary operator i.e.

Assuming A and B are two simple variables:

!A (Takes only one memory fetch operation for value of variable A and takes the compliment)
A != B (Takes two memory fetch operations and then compares there values)

Hence !A is faster.

[wwarren]

So it would be the second one of my examples?

[fayyazlodhi]

Yes