Addition and Subtraction in ASP.Net GridView row on TextBox KeyUp using jQuery

I want to calculate  in first Step as following

Recievable + Arrears -Discount = NetBal

   1000 + 250   - 250 =  1000

Then 

NetBal - Paid = RemBal

1000 - 700 = 700

    <script>
        $(function () {
            $(".field1").keyup(function () {
                var total = 0;
                $(".field1").each(function () {
                    total += parseFloat($(this).val());
                });

                $(".totaloffield td").eq(1).text(total);

                //calculate total for current row
                var val1 = $(this).val();
                var val2 = $(this).parent().parent().find(".field2").val();
                var val3 = $(this).parent().parent().find(".field3").val();

                var rowtotal = parseFloat(val1) + parseFloat(val2) - parseFloat(val3);
                $(this).parent().siblings().last().text(rowtotal);
            });

            $(".field2").keyup(function () {
                var total = 0;
                $(".field2").each(function () {
                    total += parseFloat($(this).val());
                });

                $(".totaloffield td").eq(2).text(total);

                //calculate total for current row
                var val1 = $(this).parent().parent().find(".field1").val();
                var val2 = $(this).val();
                var val3 = $(this).parent().parent().find(".field3").val();

                var rowtotal = parseFloat(val1) + parseFloat(val2) - parseFloat(val3);
                $(this).parent().siblings().last().text(rowtotal);
            });

            $(".field3").keyup(function () {
                var total = 0;
                $(".field3").each(function () {
                    total += parseFloat($(this).val());
                });

                $(".totaloffield td").eq(3).text(total);

                //calculate total for current row
                var val1 = $(this).parent().parent().find(".field1").val();
                var val2 = $(this).parent().parent().find(".field2").val();
                var val3 = $(this).val();

                var rowtotal = parseFloat(val1) + parseFloat(val2) - parseFloat(val3);
                $(this).parent().siblings().last().text(rowtotal);
            });
        })
    </script>
    <asp:GridView ID="gvBudget" runat="server" AutoGenerateColumns="False"
    Width="100%" Class="table table-striped table-bordered table-hover"
    PagerStyle-CssClass="pgr" AlternatingRowStyle-CssClass="alt"
    ShowFooter="True">
    <Columns>
        <asp:BoundField DataField="AdmissionNo" HeaderText="AdmissionNo">
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Width="10%" />
        </asp:BoundField>
        <asp:TemplateField HeaderText="Recievable">
            <ItemTemplate>
                <asp:TextBox ID="txtReci" runat="server" Text='<%# Bind("Recievable") %>'
                    Width="100%" class="field1 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>
        
        <asp:TemplateField HeaderText="Arrears">
            <ItemTemplate>
                <asp:TextBox ID="txtArr" runat="server" Text='<%# Bind("Arrears") %>'
                    Width="100%" class="field2 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>
        
        <asp:TemplateField HeaderText="Discount">
            <ItemTemplate>
                <asp:TextBox ID="txtDis" runat="server" Text='<%# Bind("CDiscount") %>'
                    Width="100%" class="field3 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>

        <asp:TemplateField HeaderText="Net Balance">
            <ItemTemplate>
                <asp:TextBox ID="txtNet" runat="server" Text='<%# Bind("NetBal") %>'
                    Width="100%" class="field4 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>

        <asp:TemplateField HeaderText="Paid">
            <ItemTemplate>
                <asp:TextBox ID="txtPaid" runat="server" Text='<%# Bind("Paid") %>'
                    Width="100%" class="field5 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>        
        
        <asp:TemplateField HeaderText="Rem Bal">
            <ItemTemplate>
                <asp:TextBox ID="txtRem" runat="server" Text='<%# Bind("RemBal") %>'
                    Width="100%" class="field6 form-control" autocomplete="off">
                </asp:TextBox>
            </ItemTemplate>
            <HeaderStyle HorizontalAlign="Left" Width="10%" />
            <ItemStyle HorizontalAlign="Left" Width="10%" />
        </asp:TemplateField>
        <asp:BoundField HeaderText="Total" />
    </Columns>
    <FooterStyle Font-Bold="True" CssClass="totaloffield" />
</asp:GridView> 

    protected void BindGrid()
    {
        con = new SqlDbConnect();
        //con.SqlQuery("select * from ( select g.AdmissionNo,Recievable,CDiscount,Arrears,sum(Head+AdmFees+TutionFees+LibFees+ExamFees+SportsFees+AnnualFees+ProspectusFees+UniformFees+BookFees+TokenFees+IDCardFees+BusCardFees+ElecFees+SchoolFund+FunFees+CSFees+GeneratorFees+SecFees+TourFees+Others) as [NetBal],c.Paid,RemBal,g.Month,c.VoucherNo from tblFeesGenerate g left outer join tblFeesCollection c on  g.AdmissionNo=c.AdmissionNo and g.Month=c.FeesMonth inner join tblStdReg as sr on g.AdmissionNo=sr.AdmissionNo  and Active_Status='Active' where  Year=@Year and Month=@Month group by g.AdmissionNo,Month,VoucherNo,Paid,CDiscount,Arrears,Recievable,RemBal) tb where VoucherNo  is null order by Month;");
        con.SqlQuery("select * from (select g.AdmissionNo,SName,sum(Head+AdmFees+TutionFees+LibFees+ExamFees+SportsFees+AnnualFees+ProspectusFees+UniformFees+BookFees+TokenFees+IDCardFees+BusCardFees+ElecFees+SchoolFund+FunFees+CSFees+GeneratorFees+SecFees+TourFees+Others) as [Recievable],c.CDiscount,c.Arrears,c.NetBal,c.Paid,c.RemBal,c.VoucherNo from tblFeesGenerate g left outer join tblFeesCollection c on  g.AdmissionNo=c.AdmissionNo and g.Month=c.FeesMonth inner join tblStdReg as sr on g.AdmissionNo=sr.AdmissionNo where Year=@Year and Month=@Month group by g.AdmissionNo,SName,VoucherNo,Recievable,Arrears,CDiscount,NetBal,Paid,RemBal) tb where VoucherNo is null;");
             
        con.Cmd.Parameters.Add(new SqlParameter("@Year", ddlFYear.SelectedItem.ToString()));
        con.Cmd.Parameters.Add(new SqlParameter("@Month", ddlMonth.SelectedItem.ToString()));
        adapt.SelectCommand = con.Cmd;
        adapt.Fill(sTable);
        if (sTable.Rows.Count > 0)
        {
            gvBudget.Visible = true;
            gvBudget.DataSource = sTable;
            gvBudget.DataBind();
            lblTotal.Text = gvBudget.Rows.Count.ToString();
        
        }
        else
        {
            gvBudget.Visible = false;
            Response.Write("No Record Found");
            lblTotal.Text = "0";
            return;
        }
        con.conClose();
    }