[sde]

this isn't going to be much help, but i love c#, but i hate asp.net!
wouldn't it be something like this?

<script runat="server">
void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
    txt_spec_name.Text = num_items.SelectedItem.ToString();
  }
}
</script>

i'm not 100% sure on this one, and i can't test it right now.