How to use Ajax Rating Control in listview?

I am using the AJAX Rating Control inside a ListView control, When I run the page it throws the error 'Specified cast is not valid'

Here Is the code 

(SELECT[prod].[prod_id],[prod].[prod_name],AVG([rates].[prod_rating]) AS[prod_rating] FROM [p1_shop] [pd] LEFT JOIN[prod_rating] [rate] ON [prod].[prod_id] = [rate].[prod_id];

 .aspx Code

<asp:ListView ID="product_list" runat="server" EnableTheming="False">
<ItemTemplate>

<cc1:Rating ID="Rating1" runat="server" currentrating='<%#Eval("rest_rating")%>' OnChanged="Rating1_Changed"
                            StarCssClass="Star" WaitingStarCssClass="WaitingStar" EmptyStarCssClass="Star"
                            FilledStarCssClass="FilledStar">
                            </cc1:Rating>

</ItemTemplate>
</asp:ListView>

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1 Answers