[b]<asp:ListBox ID="ListBox1" runat="server"
onselectedindexchanged="ListBox1_SelectedIndexChanged" AutoPostBack="True">
<asp:ListItem Value="1">Villareal</asp:ListItem>
<asp:ListItem Value="2">Desampa</asp:ListItem>
<asp:ListItem></asp:ListItem>
</asp:ListBox>[/b]