I thought I had the correct syntax to detect if a parameter has been passed.

I have the following method which accept a parameter and I would like to know if the parameter was passed.

Sub Cleanup(Optional tnError As Integer)

' If we pass a parameter
If VarType(tnError) = 2 Then
lnLastError = tnError
End If

But, this is not working because even if the tnError is not passed, the type is still integer.