If statement [RESOLVED]

in an IF statment in VB6

what expression can i use to test whether a string contains text ?

with an integer i know its

VB Code:

IF integername = NIL then
do something

VB Code:

If strTextName <> vbNullString Then
  MsgBox "Not Empty."
End If

vbNullString is the VB constant for double quotes i.e. ""

thanks