ASP.Net Nested GridView with TextBoxes - Unwanted comma in TextBox after PostBack

hi,

I used the code for gridview within a gridview using jquery functions for expanding and collapsing as shown in article : http://www.aspsnippets.com/Articles/Nested-GridView-Example-in-ASPNet-using-C-and-VBNet.aspx

It works well, but I have textbox in childgrid and it behaves wrongly when i submit childgrid data for saving, it shows character comma (,) before data enetered in textboxes.

I commented all coding for submit button outside both grids, then also on clicking of submit button, there comes comma automatically in textboxes in child grid..

Please guide, I need to use this code urgently.

--------------design------------------
<script type="text/javascript">
    $("[src*=plus]").live("click", function () {
        $(this).closest("tr").after("<tr><td></td><td colspan = '999'>" + $(this).next().html() + "</td></tr>")
        $(this).attr("src", "images/minus.png");
    });
    $("[src*=minus]").live("click", function () {
        $(this).attr("src", "images/plus.png");
        $(this).closest("tr").next().remove();
    });
</script>


<%--<script type="text/javascript">
    $("[src*=plus]").live("click", function () {
        $(this).closest("tr").after("<tr><td></td><td colspan=\"999\">" + $(this).next().html() + "</td></tr>")
        $(this).attr("src", "images/minus.png");
    });
    $("[src*=minus]").live("click", function () {
        $(this).attr("src", "images/plus.png");
        $(this).closest("tr").next().remove();
    });
</script>--%>
<style type="text/css">
    body
    {
        font-family: Arial;
        font-size: 10pt;
    }
    .Grid td
    {
        background-color: #A1DCF2;
        color: black;
        font-size: 10pt;
        line-height: 200%;
    }
    .Grid th
    {
        background-color: #3AC0F2;
        color: White;
        font-size: 10pt;
        line-height: 200%;
    }
    .ChildGrid td
    {
        background-color: #eee !important;
        color: black;
        font-size: 10pt;
        line-height: 200%;
    }
    .ChildGrid th
    {
        background-color: #6C6C6C !important;
        color: White;
        font-size: 10pt;
        line-height: 200%;
    }
</style>
<table width="100%">
    <tr>
        <td>
            <asp:Label ID="lblFinYear" runat="server" Text="Financial Year"></asp:Label>
        </td>
        <td>
            <asp:DropDownList CssClass="" ID="dpdFinancialYear" runat="server">
            </asp:DropDownList>
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblDemand" runat="server" Text="Demand No."></asp:Label>
        </td>
        <td>
            <asp:DropDownList CssClass="" ID="dpdDemand" runat="server" 
                onselectedindexchanged="dpdDemand_SelectedIndexChanged" 
                AutoPostBack="True">
            </asp:DropDownList>
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblTotalTentativeFund" runat="server" Text="Total Tentative Fund :"></asp:Label>
        </td>
        <td>
            <asp:TextBox ID="txtTotalTentativeFund" runat="server" Text=""></asp:TextBox>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:GridView ID="grdMajorHeads" Width="100%" runat="server" AutoGenerateColumns="false" CssClass="Grid"
                 DataKeyNames="MajorHeadID_N" OnRowDataBound="grdMajorHeads_RowDataBound">
                <Columns>
                    
                    <asp:BoundField  DataField="MajorHeadID_N" HeaderText="Major Head Id"
                        Visible="false" />
                    <asp:BoundField  DataField="MajorHeadCode_V" HeaderText="Major Head" />
                    <asp:BoundField  DataField="MajorHeadName_V" HeaderText="Major Head Name" />
                    <asp:TemplateField ItemStyle-HorizontalAlign="Right" HeaderText="Tentaive Fund in Major Head(In Lacs">
                        <ItemTemplate>
                            <asp:TextBox ID="txtMajorHeadTentativeFund" CssClass="input_N" runat="server"></asp:TextBox>
                        </ItemTemplate>
                    </asp:TemplateField>


                    <asp:TemplateField>
                        <ItemTemplate>
                        <table><tr><td>
                            <%--<img alt="" style="cursor: pointer" src="../../Images/plus.png" />--%>
                            <%--<asp:Panel ID="pnlSchemes" runat="server" style="display:inline" >--%>
                            
                                <asp:GridView ID="grdSchemes"  Width="100%" runat="server"  CssClass="ChildGrid"
                                OnRowDataBound="grdSchemes_RowDataBound" AutoGenerateColumns="false" >
                                    <Columns>

                                        <asp:BoundField  DataField="SchemeID_N" Visible="true" />
                                        <asp:BoundField  DataField="SchemeCode_V" HeaderText="Scheme" />
                                        <asp:BoundField  DataField="SchemeName_V" HeaderText="Scheme Name" />
                                        <asp:TemplateField ItemStyle-HorizontalAlign="Right" HeaderText="Tentaive Fund in Scheme(In Lacs)">
                                            <ItemTemplate>
                                                <asp:TextBox ID="txtSchemeTentativeFund" Text="" AutoCompleteType="None" value="" CssClass="input_N" runat="server"></asp:TextBox>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField>
                                            <ItemTemplate>
                                            <table><tr><td>
                                                <img alt="" style="cursor: pointer" src="../../Images/plus.png" />
                                                <asp:Panel ID="pnlComponents" runat="server" Style="display: none">
                                                    <asp:GridView ID="grdComponents" Width="100%" runat="server" AutoGenerateColumns="false" CssClass="Grid" >
                                                        <Columns>
                                                            <asp:BoundField  DataField="MapID_N" Visible="false" />
                                                            <%--<asp:BoundField  DataField="Code_V" HeaderText="Component/Scheme Type Code" />--%>
                                                            <asp:BoundField  DataField="Name_V" HeaderText="Component/Scheme Type Name" />
                                                            <asp:TemplateField ItemStyle-HorizontalAlign="Right" HeaderText="Tentaive Fund(In Lacs)">
                                                                <ItemTemplate>
                                                                    <asp:TextBox ID="txtCompFundAmount" Text="" CssClass="input_N" runat="server"></asp:TextBox>
                                                                </ItemTemplate>
                                                            </asp:TemplateField>
                                                        </Columns>
                                                    </asp:GridView>
                                                </asp:Panel>
                                                </td></tr></table>
                                        </ItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>
                               
                           <%-- </asp:Panel>--%>
                            </td></tr></table>
                        </ItemTemplate>
                    </asp:TemplateField>



                </Columns>
            </asp:GridView>
        </td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:Button ID="btnSubmit" Text="Submit Tentative Plan" runat="server" OnClick="btnSubmit_Click" />
        </td>
    </tr>
</table>