how to get the output of rating control in ajax?

<form id="form1" runat="server">
  <asp:ScriptManager ID="sm" runat="server" />
   <div>
   <div class="demoarea">
     <div class="demoheading">Rating Demonstration </div>
       <asp:UpdatePanel ID="UpdatePanel1" runat="server">
           <ContentTemplate>
             <div style="float: left; width:230;">How much do you like ASP.NET AJAX ?</div>
               <cc1:Rating ID="LikeRating" runat="server"
                   CurrentRating="3"
                   MaxRating="5"
                   StarCssClass="ratingStar"
                   WaitingStarCssClass="savedRatingStar"
                   FilledStarCssClass="filledRatingStar"
                   EmptyStarCssClass="emptyRatingStar"
                   OnChanged="LikeRating_Changed"
                   style="float: left;">
               </cc1:Rating>

               <br />
               <div style="clear:left;">
               <br />
                   <asp:Button ID="ButtonSubmit" runat="server" Text="Submit"
                       onclick="ButtonSubmit_Click" /><br /><br />
                   <asp:Label ID="LabelResponse" runat="server" Text="[ No response provioded yet.]"></asp:Label>
               </div>
           </ContentTemplate>
       </asp:UpdatePanel>
   </div>
   </div>
   </form>

protected void LikeRating_Changed(object sender, AjaxControlToolkit.RatingEventArgs e)
    {
        e.CallbackResult = "Upate done. Value = " + e.Value + " Tag = " + e.Tag;
    }
    protected void ButtonSubmit_Click(object sender, EventArgs e)
    {
        string howMuch = "[unknown]";

        switch (LikeRating.CurrentRating)
        {
            case 1:
                howMuch = "a bit.";
                break;
            case 2:
                howMuch = "some.";
                break;
            case 3:
                howMuch = "a fair bit.";
                break;
            case 4:
                howMuch = "a lot.";
                break;
            case 5:
                howMuch = "more than any thing.";
                break;
        }

        LabelResponse.Text = "You like ASP.NET AJAX <b>" + howMuch + "</b>.";
    }