Read Values from Nested ListView

I am using a nested ListView as a data entry form and have everything bound exactly right.  The basic format is:
<ListView1>
<Item Template>
<ListView2>
<some controls in ListView2 with values from database and user-entered>

The problem comes on submit when I am trying to get values from the form.  I am looping through both listviews but debug shows I am not finding ListView2 and consequently none of its controls.  Can someone please tell me where I am going wrong?

Dim arrSpecies As New ArrayList()
        For Each item As ListViewItem In ListView1.Items
            Dim ListView2 As ListView = DirectCast(ListView1.FindControl("ListView2"), ListView)
            For Each row As ListViewItem In ListView2.Items
                Dim hfSpeciesID As HiddenField = DirectCast(row.FindControl("hfSpeciesID"), HiddenField)
                Dim SpeciesID As String = hfSpeciesID.Value
                Dim tbHowMany As TextBox = DirectCast(row.FindControl("tbHowMany"), TextBox)
                Dim Individuals As String = tbHowMany.Text
                If Individuals <> "" Then
                    Dim v As String = SpeciesID & "-" & Individuals
                    arrSpecies.Add(v)
                End If
            Next
        Next
Thanks for your help!