[AccessD] Syntax question

Good morning,

I can't figure this out.

Private Sub cmdNew_Click()
If cmdPositiveEmail.Enabled = True And txtEmailDate.Value = Null Then
        MsgBox "You must send an email before leaving this record." & vbNewLine & _
        "To send an email, click the email button."
Else
        Call adhNavNew([Form])
End If

End Sub

On the above event even though cmdPositiveEmail.Enabled = True And txtEmailDate.Value = Null 
the routine pops to the else portion of this event.  Can someone direct me on what maybe wrong?

Thanks

Lorraine




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