VB6 Functions: Optional Parameters

How do I test for the presence of an option parameter with a function?

Example

Public Sub GridWrite(Grid As Control, FileName As String, Optional AnyForm As Form)

I want to see if the optional parameter "Anyform" was given by the calling form.

I tried:
if AnyForm.Name>"" then
' statements when parameter is given
endif

but I get an error 91: Object variable or With block variable not set.

Same thing with:
if AnyForm >'' then

If the optional parameter is an Integer, then a zero is given but when the parameter is a form, I get the error.

Thanks for your help

You should rather check for Nothing. Something like this

Code:

---

Public Sub GridWrite(Grid As Control, FileName As String, Optional AnyForm As Form)

If Not AnyForm Is Nothing Then
      'AnyForm was passed from the calling function
Else
      'AnyForm was not passed from the calling function
End If

---

Thank you Shuja Ali !!

Just what I needed.

ABasicNut