To check an empty string into a variable

[cesark]

How can I check an empty string into a variable?

For instance, I want to check if the 'Var2' is equal to empty string (I mean nothing):

If ((Var1 = 7) AND (Var2 = "")) Then
        value.IsValid = False
        Exit Sub
End If

In this way (Var 2= "") doesn' t run

Thanks,
Cesar