IsNull Function

Syntax:
IsNull(expr)
Group: Variable Info
Description:
Return the True if expr is Null.
Parameter Description

expr A variant expression to test for Null.
See Also: TypeName, VarType.
Example:

Sub Main
Dim X As Variant
Debug.Print IsEmpty(X) 'True
Debug.Print IsNull(X) 'False
X = 1
Debug.Print IsNull(X) 'False
X = "1"
Debug.Print IsNull(X) 'False
X = Null
Debug.Print IsNull(X) 'True
X = X*2
Debug.Print IsNull(X) 'True
End Sub