How do I check for an object being Nothing in VB6?

In my VB6 application I have an array of objects declared thus...

Dim MyArray() as MyClass

This array is filled in as processing goes on

Set MyArray(element) = passed_object

and as elements are no longer wanted,

Set MyArray(otherelement) = Nothing

When using the array, I want to use a loop like

For i = 1 To Ubound(MyArray)
    If MyArray(i) <> Not开发者_StackOverflow社区hing Then    ' Doesn't compile
        ...do something...
    End If
Next i

But I can't get anything likely-looking to compile. I've also tried

If MyArray(i) Is Not Nothing Then

Should I want to do this, and if so, what test should I put in here?

If Not MyArray(i) Is Nothing Then

If Not MyArray(i) Is Nothing Then

Instead of

IsNothing(<object here>)

this should work in VB6:

<object here> Is Nothing

    Private Function IsNothing(objParm As Object) As Boolean
        IsNothing = IIf(objParm Is Nothing, True, False)
    End Function