Move specific row from one datatable to another

I have a simple .aspx webpage  with two listboxes.  I start on the initial page load by binding Listbox1 to a datatable and Listbox2 to another datatable :

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        'Label1.Text = ADS1.ConnectionString
        If Not Page.IsPostBack Then
            ListLoad()
        End If
End Sub

Private Sub ListLoad()
        Dim dv As System.Data.DataView = CType(ADS1.Select(DataSourceSelectArguments.Empty), System.Data.DataView)
        dt = dv.ToTable
        cdt = dt.Clone
        
        ListBox1.DataSource = dt
        ListBox1.DataValueField = "ID"
        ListBox1.DataTextField = "FullName"
        ListBox1.DataBind()

        ListBox2.DataSource = cdt
        ListBox2.DataValueField = "ID"
        ListBox2.DataTextField = "FullName"
        ListBox2.DataBind()    
End Sub

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So far everything is working fine and I have the two listboxes to play around with and can move stuff back and forth once the listboxes have been bound to a null.  My issue is trying to move the data in the datatables back and forth (which is why I set up two datatables and bound the listboxes in the first place).  Could someone please explain and possibly provide an example of how I could find the associated row in dt and move it to cdt if that corresponding row in listbox1 is selected?  Ideally I want to be able to handle multiple selected values in Listbox1 use  'For Each item As ListItem In ListBox1.Items...Next'  to handle this.  Thanks a ton!