how to calculate total in datalist by adding label box value

hello, I'm displaying cart by using datalist. How do I add the price of all the products displaying in the datalist. pls help.
this is the design of my datalist
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource2">
        <ItemTemplate>
            <table style="width:100%;">
                <tr>
                    <td class="style5" style="font-size: x-large; font-weight: 700">
                        <asp:Label ID="Label2" runat="server" Text='<%# Eval("Brand") %>'></asp:Label>
                    </td>
                    <td class="style6">
                        Total Amout to paid</td>
                    <td>
                        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/close.png"
                            onclick="ImageButton1_Click" />
                    </td>
                </tr>
                <tr>
                    <td class="style5">
                        <asp:Image ID="Image1" runat="server" Height="146px"
                            ImageUrl='<%# Eval("Image") %>' Width="133px" />
                    </td>
                    <td class="style6">
                        Rs.<asp:Label ID="Label3" runat="server" Text='<%# Eval("Price") %>'></asp:Label>
                    </td>
                    <td>
                        &nbsp;</td>
                </tr>
                <tr>
                    <td class="style5">
                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("Modelid") %>'></asp:Label>
                    </td>
                    <td class="style6">
                        &nbsp;</td>
                    <td>
                        &nbsp;</td>
                </tr>
                <tr>
                    <td class="style3" style="text-align: right">
                        <b>Total</b></td>
                    <td class="style4">
                        <b>Rs.<asp:Label ID="Label4" runat="server" Text='<%# Eval("Price") %>'></asp:Label>
                        </b>
                    </td>
                    <td>
                        &nbsp;</td>
                </tr>
                <tr>
                    <td class="style3" style="text-align: left">
                        &nbsp;</td>
                    <td class="style4">
                        <asp:Button ID="Button1" runat="server" Text="PROCEED" onclick="Button1_Click" CommandArgument='<%# Eval("Modelid") %>' CommandName="Proceed"
                            style="font-weight: 700"  />
                    </td>
                    <td>
                        &nbsp;</td>
                </tr>
                <tr>
                    <td class="style3" style="text-align: left">
                    </td>
                    <td class="style4">
                        &nbsp;</td>
                    <td>
                        &nbsp;</td>
                </tr>
            </table>
            <br />
        </ItemTemplate>
        </asp:DataList>
 
    <asp:SqlDataSource ID="SqlDataSource2" runat="server"
        ConnectionString="<%$ ConnectionStrings:VISHConnectionString8 %>"
        SelectCommand="SELECT * FROM [cart] WHERE ([uname] = @uname)">
        <SelectParameters>
            <asp:SessionParameter Name="uname" SessionField="UN" Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>
 
    <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:VISHConnectionString8 %>"
        SelectCommand="SELECT * FROM [cart] WHERE ([Modelid] = @Modelid)">
        <SelectParameters>
            <asp:SessionParameter Name="Modelid" SessionField="modelid" Type="String" />
        </SelectParameters>
    </asp:SqlDataSource>