c# - Add subtotals to Gridview & percentage difference -

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i have gridview derived sql statement. want display subtotals each column , display overall percentage increase/decrease between 2 date ranges. how go this?

        <%@ page title="" language="c#" masterpagefile="~/masterpage.master" autoeventwireup="true" codebehind="sales-comparison.aspx.cs" inherits="towelsrusv3.sales_comparison" %>         <asp:content id="content1" contentplaceholderid="contentplaceholder1" runat="server">             <div class="panel panel-info">           <div class="panel-heading">               <h1 class="panel-title text-center">sales comparison</h1>            </div>           <div class="panel-body">            <div class="row">                <div class="col-lg-8">                              <asp:gridview id="gridview1" runat="server" autogeneratecolumns="false" datasourceid="sqldatasource1" cssclass="table table-bordered table-responsive table-striped" onselectedindexchanged="gridview1_selectedindexchanged" showfooter="true">                       <columns>                           <asp:boundfield datafield="orderdate" headertext="orderdate" readonly="true" sortexpression="orderdate" />                           <asp:boundfield datafield="total2014" headertext="total2014" readonly="true" sortexpression="total2014" />                           <asp:boundfield datafield="total2013" headertext="total2013" readonly="true" sortexpression="total2013" />                           <asp:boundfield datafield="difference" headertext="difference" readonly="true" sortexpression="difference" />                       </columns>                   </asp:gridview>                   <asp:sqldatasource id="sqldatasource1" runat="server" connectionstring="<%$ connectionstrings:livedatav2connectionstring %>" selectcommand="select          table2014.orderdate,         isnull(table2014.total,0) total2014,         isnull(table2013.total,0) total2013,         isnull(table2014.total,0)-isnull(table2013.total,0) difference                          (select sum(order_header_total.oht_net) total,                dateadd(day,0,datediff(d,0,order_header.oh_datetime)) orderdate                order_header_total                inner join order_header on order_header_total.oht_oh_id = order_header.oh_id                (order_header.oh_datetime between '12/01/2014' , '12/31/2014')                 , order_header.oh_os_id in (1, 6, 4)                group dateadd(day,0,datediff(d,0,order_header.oh_datetime))) table2014          left outer join                (select sum(order_header_total.oht_net) total,                dateadd(year,1,dateadd(day,0,datediff(d,0,order_header.oh_datetime))) orderdate                order_header_total                inner join order_header on order_header_total.oht_oh_id = order_header.oh_id                (order_header.oh_datetime between dateadd(year,-1,'12/01/2014') , dateadd(year,-1,'12/31/2014'))                , order_header.oh_os_id in (1, 6, 4)                group dateadd(year,1,dateadd(day,0,datediff(d,0,order_header.oh_datetime)))) table2013 on table2013.orderdate = table2014.orderdate          order table2014.orderdate"></asp:sqldatasource>                    </div>                </div>               </div>                 </div>         </asp:content>

you should able add new column @ end of select statement similar 

sum(table_a.col1) + sum(table_b.coly) subtotal

then same sort of thing percentage column figure out how calculate percentage.


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