Subtotal in Gridview control

Subtotal in Gridview control in order Details page on Raasa.

Step 1 :

<asp:GridView ID="gvworderdetails" runat="server"  AutoGenerateColumns="False"

                                onrowdatabound="gvworderdetails_RowDataBound" ShowFooter="True"

                                Width="100%" >

                                <Columns>

                                    <asp:BoundField DataField="type" HeaderText="Type" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" ItemStyle-Height="20px"/>

                                    <asp:BoundField DataField="item_desc" HeaderText="Item Description" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" ItemStyle-Height="20px"/>

                                    <asp:BoundField DataField="status" HeaderText="Status" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" ItemStyle-Height="20px"/>

                                    <%--<asp:BoundField DataField="details" HeaderText="Details" />--%>

                                    <asp:BoundField DataField="price" HeaderText="Price" HeaderStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center"/>

                                       

                                    <asp:TemplateField HeaderText="Qty">

                                    <FooterStyle Font-Bold="true" Font-Size="13px" />

                                        <FooterTemplate>Grand Total :</FooterTemplate>

                                        <ItemTemplate>

                                            <asp:Label ID="lblqty" runat="server" Text='<%# Eval("qty") %>'></asp:Label>

                                        </ItemTemplate>

                                        <ItemStyle HorizontalAlign="Center" Height="20px"/>

                                        <FooterStyle HorizontalAlign="Right" Height="20px"/>

                                    </asp:TemplateField>

                                    <asp:TemplateField HeaderText="Sub Total">

                                        <ItemTemplate>

                                            <asp:Label ID="lblsubtot" runat="server" Text='<%# Eval("SubTotal") %>'></asp:Label>

                                        </ItemTemplate>

                                        <FooterTemplate>

                                            <asp:Label ID="lbltotal" runat="server" Font-Bold="True" Font-Size="13px"></asp:Label>

                                        </FooterTemplate>

                                        <ItemStyle HorizontalAlign="Center" Height="20px"/>

                                        <FooterStyle HorizontalAlign="Center" Height="20px"/>

                                    </asp:TemplateField>                                      

                                </Columns>

                                <HeaderStyle Height="25px" BackColor="#3b6c01" ForeColor="#ffffff" />

                            </asp:GridView>

Step 2 :

decimal total = 0;

        DataSet ds = new DataSet();

        DataSet ds1 = new DataSet();

        DataSet ds2 = new DataSet();

 public void BindGrid(string order_id)

        {

            //

            bl_raasa csobj = new bl_raasa();

            ds2 = csobj.GetGridBind(order_id);

            if (ds2.Tables[0].Rows.Count > 0)

            {

                gvworderdetails.DataSource = ds2.Tables[0];

                gvworderdetails.DataBind();

            }

        }

        protected void gvworderdetails_RowDataBound(object sender, GridViewRowEventArgs e)

        {

            if (e.Row.RowType == DataControlRowType.DataRow)

            {

                total += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "SubTotal"));

              

            }

            if (e.Row.RowType == DataControlRowType.Footer)

            {

                Label lbl = (Label)e.Row.FindControl("lblTotal");

                lbl.Text = total.ToString() ;

            }

        }