<script runat="server">
Sub Car_Click(sender as Object, e as EventArgs)
  ActiveForm=f2
  t1.text=cars.Selection.Value
End Sub
</script>

<Mobile:Form id="f1" runat="server">
<Mobile:SelectionList runat="server" id="cars" >
  <Item Text="Volvo" Value="$30,000" />
  <Item Text="BMW" Value="$32,000" />
  <Item Text="Audi" Value="$34,000" />
</Mobile:SelectionList>
<Mobile:Command runat="server"
  OnClick="Car_Click" Text="Submit" />
</Mobile:Form>

<Mobile:Form id="f2" runat="server">
<Mobile:Label id="t1" runat="server" />
</Mobile:Form>