How to display ajax rating in gridview

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Gridview

i am trying to display Ajax Rating in the DataGrid..error is "

Specified cast is not valid."

.What is the best way to use Ajax Rating in the Gridview?

What I have tried:

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:iuploadConnectionString %>" 
        SelectCommand="SELECT * FROM [tb_Gallery]"></asp:SqlDataSource>
    
    <br />
    <cc1:ToolkitScriptManager ID="ToolkitScriptManager2" runat="server">
    </cc1:ToolkitScriptManager>

                <asp:GridView ID="GridView2" runat="server"
                 
                    BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" 
                    CellPadding="4"  
                    Width="69px"  
        
                   >
       
          
        
                    <Columns>
                    <%--here i am using templatefields to for binding the gridview--%>
                        <asp:TemplateField HeaderText="Album_name">
                            <EditItemTemplate>
                           
                     <%--here i am using the textbox in the edititmtemplatefield to upadate the data--%>
                                <asp:TextBox ID="txt_album_name" runat="server"
                                    Text='<%# Eval("album_name") %>'></asp:TextBox>
                                <asp:Label ID="Label4" runat="server" Text='<%# Eval("id") %>' Visible="False"></asp:Label>
                            </EditItemTemplate>
                            <ItemTemplate>
                                <asp:Label ID="Label1" runat="server" Text='<%# Eval("album_name") %>'></asp:Label>
                                <asp:Label ID="Label2" runat="server" Text='<%# Eval("id") %>' Visible="False"></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Caption">
                            <EditItemTemplate>
                                <asp:TextBox ID="txt_caption" runat="server" Text='<%# Eval("caption") %>'></asp:TextBox>
                            </EditItemTemplate>
                            <ItemTemplate>
                                <asp:Label ID="Label3" runat="server" Text='<%# Eval("caption") %>'></asp:Label>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Image">
                        <ItemTemplate>
                        <%--for displaying the image inside the gidview here i'm using the <img>tag
                        and specify the path of the folder where image is stored--%>
                        <img alt ="" src ='images/<%#Eval("image") %>' height="200px" width="200px"/>
                        </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Delete">
                        <%--here i am using the linkbutton to delete the record and specify the command name
                        of this linkbutton is delete--%>
                            <ItemTemplate>
                                <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
                                    CommandName="Delete"
                                    onclientclick="return confirm('are you sure you want to delet this column')">Delete</asp:LinkButton>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Update">
                            <EditItemTemplate>
                           <%-- here i am using the s linkbuttons to update the record and a  cancel button
                           and set the commandname of update button is update and the cancel button is cancel --%>
                                <asp:LinkButton ID="LinkButton3" runat="server" CausesValidation="False"
                                    CommandName="Update">Update</asp:LinkButton>
                                <asp:LinkButton ID="LinkButton4" runat="server" CausesValidation="False"
                                    CommandName="Cancel">Cancel</asp:LinkButton>
                            </EditItemTemplate>
                            <ItemTemplate>
                                
                               <%--here i am using the linkbutton for edit and specify the command name
                        of this linkbutton is Edit--%>
                                <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False"
                                    CommandName="Edit">Edit</asp:LinkButton>
                            </ItemTemplate>
                        
                        </asp:TemplateField>
        <asp:TemplateField HeaderText="Rating">
            <ItemTemplate>
                <cc1:Rating ID="Rating1" AutoPostBack="true"  runat="server"
                    StarCssClass="Star" WaitingStarCssClass="WaitingStar" EmptyStarCssClass="Star"
                    FilledStarCssClass="FilledStar" CurrentRating='<%# Eval("Rating") %>'>
                </cc1:Rating>
            </ItemTemplate>
        </asp:TemplateField>
                       
                    </Columns>
                    <EditRowStyle BorderWidth="60px" Width="60px" />
                    <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
                    <HeaderStyle BackColor="#003399" Font-Bold="True" ForeColor="#CCCCFF" />
                    <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
                    <RowStyle BackColor="#999999" ForeColor="#003399" Width="70px" />
                    <SelectedRowStyle BackColor="Blue" Font-Bold="True" ForeColor="#CCFF99" 
                        BorderColor="#0066CC" />
                    <SortedAscendingCellStyle BackColor="#EDF6F6" />
                    <SortedAscendingHeaderStyle BackColor="#0D4AC4" />
                    <SortedDescendingCellStyle BackColor="#D6DFDF" />
                    <SortedDescendingHeaderStyle BackColor="#002876" />
                </asp:GridView>
   
    <cc1:Rating ID="Rating2" runat="server">
    </cc1:Rating>
    <cc1:Rating ID="Rating1" runat="server">
    </cc1:Rating>
  
   
    <asp:SqlDataSource ID="SqlDataSource3" runat="server" 
        ConnectionString="<%$ ConnectionStrings:iuploadConnectionString %>" 
        SelectCommand="SELECT * FROM [Ratings]"></asp:SqlDataSource>