[c#] Displaying Total in Footer of GridView and also Add Sum of columns(row vise) in last Column

Sample Code: To set Footer text programatically

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
      if (e.Row.RowType == DataControlRowType.Footer)
      {
         Label lbl = (Label)e.Row.FindControl("lblTotal");
         lbl.Text = grdTotal.ToString("c");
      }
   }

UPDATED CODE:

  decimal sumFooterValue = 0;
  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
         string sponsorBonus = ((Label)e.Row.FindControl("Label2")).Text;
         string pairingBonus = ((Label)e.Row.FindControl("Label3")).Text;
         string staticBonus = ((Label)e.Row.FindControl("Label4")).Text;
         string leftBonus = ((Label)e.Row.FindControl("Label5")).Text;
         string rightBonus = ((Label)e.Row.FindControl("Label6")).Text;
         decimal totalvalue = Convert.ToDecimal(sponsorBonus) + Convert.ToDecimal(pairingBonus) + Convert.ToDecimal(staticBonus) + Convert.ToDecimal(leftBonus) + Convert.ToDecimal(rightBonus);
         e.Row.Cells[6].Text = totalvalue.ToString();
         sumFooterValue += totalvalue; 
        }

    if (e.Row.RowType == DataControlRowType.Footer)
        {
           Label lbl = (Label)e.Row.FindControl("lblTotal");
           lbl.Text = sumFooterValue.ToString();
        }

   }

In .aspx Page

 <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource1" 
        AutoGenerateColumns="False" DataKeyNames="ID" CellPadding="4" 
        ForeColor="#333333" GridLines="None" ShowFooter="True" 
                onrowdatabound="GridView1_RowDataBound">
        <RowStyle BackColor="#EFF3FB" />
        <Columns>
            <asp:TemplateField HeaderText="Report Date" SortExpression="reportDate">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("reportDate") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" 
                        Text='<%# Bind("reportDate", "{0:dd MMMM yyyy}") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Sponsor Bonus" SortExpression="sponsorBonus">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("sponsorBonus") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label2" runat="server" 
                        Text='<%# Bind("sponsorBonus", "{0:0.00}") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Pairing Bonus" SortExpression="pairingBonus">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("pairingBonus") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label3" runat="server" 
                        Text='<%# Bind("pairingBonus", "{0:c}") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Static Bonus" SortExpression="staticBonus">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox4" runat="server" Text='<%# Bind("staticBonus") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label4" runat="server" Text='<%# Bind("staticBonus") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Left Bonus" SortExpression="leftBonus">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox5" runat="server" Text='<%# Bind("leftBonus") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label5" runat="server" Text='<%# Bind("leftBonus") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Right Bonus" SortExpression="rightBonus">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox6" runat="server" Text='<%# Bind("rightBonus") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label6" runat="server" Text='<%# Bind("rightBonus") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Total" SortExpression="total">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox7" runat="server"></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:Label ID="lbltotal" runat="server" Text="Label"></asp:Label>
                </FooterTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label7" runat="server"></asp:Label>
                </ItemTemplate>
                <ItemStyle Width="100px" />

            </asp:TemplateField>
        </Columns>
        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#2461BF" />
        <AlternatingRowStyle BackColor="White" />            
    </asp:GridView>

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