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

       
           
               
                   
                   
                   
               
               
                   
                   
                   
               
               
                   
                   
                   
               
               
                   
                   
                   
               
               
                   
                   
                   
               
               
                   
                   
                   
               
           

	Total Amout to paid	onclick="ImageButton1_Click" />
ImageUrl='<%# Eval("Image") %>' Width="133px" />	Rs.
Total	Rs.
	style="font-weight: 700"  />

           

       
       
 
            ConnectionString="<%$ ConnectionStrings:VISHConnectionString8 %>"
        SelectCommand="SELECT * FROM [cart] WHERE ([uname] = @uname)">
       
           
       
   
 
            ConnectionString="<%$ ConnectionStrings:VISHConnectionString8 %>"
        SelectCommand="SELECT * FROM [cart] WHERE ([Modelid] = @Modelid)">