Add ToolTips to listbox items in ASP.NET (VB.NET)

Private Sub MyListBox_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles
    MyListBox.PreRender
    Dim i As Integer = 0
    Dim myToolTips As String() = MyHiddenField.Value.Split("|")
    For Each item As ListItem In MyListBox.Items
        item.Attributes.Add("title", myToolTips(i))
        i = i + 1
    Next
End Sub

Thank you to http://msmvps.com/blogs/deborahk/archive/2010/01/31/asp-net-listbox-tooltip.aspx