I want the sum of two text box values
Total Balance + Net Balance
In the textbox of Balance.
I wrote the following Jquery from the link
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $("[id*=TextBox3]").val(parseInt($("[id*=TextBox1]").val()) + parseInt($("[id*=TextBox2]").val()));
    });
</script>
I want the sum of gridview rows like that
Product       Qty       Rate     Total
A                  2         100       200
B                  3         100       300 
C                  4         100       400
Balance  =     5000 (this will be fetched from database)             
NetBalance = 900 (this will be rowTotal if 3 rows selected then
sum of 3 rows. if 5 rows is selected then the sum of 5 rows)
Total Balance = 5900 (Balance + NetBalance)
how to get solution please.
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    <script type="text/javascript">
        $(function () {
            $("[id*=txtPaid]").keyup(function () {
                var rowtotal = $(this).closest('tr').find('[id*=txtNet]').val();
                var paid = $(this).val();
                $(this).closest('tr').find('[id*=txtRem]').val(parseFloat(rowtotal) - parseFloat(paid));
            });
        })
    </script> 
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript"> 
        function CalculateSumTotal() {
            var grandTotal = 0;
            $("[id*=lblTotal]").each(function () {
                grandTotal = grandTotal + parseFloat($(this).html());
            });
 
            $('[id*=txtTotal]').val(grandTotal);
            // $('[id*=txtTotal]').val(grandTotal + parseFloat($("[id*=txtBalance]").val());
        }
    </script>
    <div class="content-wrapper" style="background-color: blue;">
        <div class="content">
            <div class="connectedSortable" style="margin-left: 10px;">
                <div class="col-sm-1">
                </div>
                <div class="col-sm-12">
                    <div class="modal-content">
                        <div class="modal-header" style="background-color: #4682B4; color: #fff">
                            <strong><span class="fa fa-signal"></span>  Purchase Order</strong>
                        </div>
                        <div class="modal-body">
                            <div class="form-group"> 
                            <div class="row">
                                <div class="col-sm-12 ">
                                    <div class="table-responsive">
                                        <asp:GridView ID="GridView1" runat="server" AllowPaging="false" Class="table table-striped table-bordered table-hover"
                                            AutoGenerateColumns="false" RowStyle-Wrap="false" HeaderStyle-Wrap="true" ShowFooter="false">
                                            <Columns>
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        <asp:CheckBox ID="checkAll" runat="server" onclick="checkAll(this);" />
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:CheckBox ID="CheckBox1" runat="server" onclick="Check_Click(this)" />
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                                <asp:TemplateField HeaderText="Product ID" ItemStyle-Width="150">
                                                    <ItemTemplate>
                                                        <asp:Label ID="lblCode" runat="server" Text='<%# Eval("ProductID") %>'></asp:Label>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                                <asp:BoundField ItemStyle-Width="200px" DataField="P_Name" HeaderText="Product Name" />
                                                <asp:BoundField ItemStyle-Width="100px" DataField="BSize" HeaderText="Bag Size" ItemStyle-CssClass="bag" />
 
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        Bag No / Qty
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="txtQuantity" runat="server" Text="0" class="field1 form-control" Width="100"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        Rate
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="txtRate" runat="server" Text="0" class="field2 form-control" Width="100" ItemStyle-CssClass="price"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
 
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        Discount
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="txtDiscount" runat="server" Text="0" class="field3 form-control" Width="100" ItemStyle-CssClass="discount"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
 
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        Net
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="txtNet" runat="server" Text="0" class="field4 form-control" Width="100" ItemStyle-CssClass="pay"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
 
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        Paid
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="txtPaid" runat="server" Text="0" class="field5 form-control" Width="100" ItemStyle-CssClass="paid"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
 
                                                <asp:TemplateField>
                                                    <HeaderTemplate>
                                                        RemBal
                                                    </HeaderTemplate>
                                                    <ItemTemplate>
                                                        <asp:TextBox ID="TextBox1" runat="server" Text="0" class="field6 form-control" Width="100" ItemStyle-CssClass="rem"></asp:TextBox>
                                                    </ItemTemplate>
                                                </asp:TemplateField>
 
                                                <asp:TemplateField HeaderText="Total">
                                                    <ItemTemplate>
                                                        <asp:Label ID="lblTotal" runat="server" Text="0" class="control-label"></asp:Label>
                                                        <asp:HiddenField ID="hdnfldBag" runat="server" />
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                            </Columns>
                                        </asp:GridView>
                                        <br />
                                        Grand Total:
                                        <asp:Label ID="lblGrandTotal" runat="server" Text="0"></asp:Label>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</asp:Content>