Adding new Row while exporting ASP.Net GridView to Excel in C# and VB.Net

Dear Sir 

Please help me to add new rows at top of Excel sheet while exporting to Excel from GridView and how to stop running loader.

<%-- Start Exchange Rate list --%>
<div class="container mb-0 mt-0 ">
    <div class="row g-0 pt-0 " style="">
        <asp:Panel ID="Panel1" runat="server">
            <div class="col col-12 justify-content-center">
                <asp:GridView ID="GvExchangeRate" Font-Size="10px" runat="server"
                    Style="width: 80%; align-items: center; border-collapse: collapse;"
                    AutoGenerateColumns="false" CssClass="MyDataGridViewListTwo"
                    EmptyDataText="No Record Found"
                    EmptyDataRowStyle-ForeColor="Red"
                    EmptyDataRowStyle-Font-Bold="true"
                    EmptyDataRowStyle-BorderStyle="None"
                    HorizontalAlign="Left"
                    AllowSorting="true"
                    OnSorting="OnSorting" OnRowDataBound="GvExchangeRate_RowDataBound">
                    <RowStyle CssClass="rows"></RowStyle>
                    <Columns>
                        <asp:TemplateField HeaderText="Sr.No" ItemStyle-Width="30" ItemStyle-HorizontalAlign="Left">
                            <ItemTemplate>
                                <asp:Label ID="lblRowNumber" Text='<%# Container.DataItemIndex + 1 %>' runat="server" />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:BoundField DataField="SetDate" HeaderText="Active Date" SortExpression="SetDate" ItemStyle-Wrap="False" DataFormatString="{0:dd-MMM-yyyy}"></asp:BoundField>
                        <asp:BoundField DataField="DeactiveDate" HeaderText="Deactive Date" SortExpression="DeactiveDate" ItemStyle-Wrap="False" DataFormatString="{0:dd-MMM-yyyy}"></asp:BoundField>
                        <asp:BoundField DataField="Currency" HeaderText="Currency" ItemStyle-Wrap="False"></asp:BoundField>
                        <asp:BoundField DataField="ExchangeRate" HeaderText="ExchangeRate" ItemStyle-Wrap="False"></asp:BoundField>
                        <asp:BoundField DataField="ActiveStatus" HeaderText="ActiveStatus" ItemStyle-Wrap="False"></asp:BoundField>

                    </Columns>
                </asp:GridView>
            </div>
        </asp:Panel>
    </div>
    <br />
    <br />
</div>
<%-- End Currency list --%>
<%-- Start Export To Export --%>
<div class="container mb-0">
    <div class="row g-0 " style="background-image: linear-gradient(to right, #e6d2fa ,#e6d2fa);">
        <div class="col-12 d-flex justify-content-start">
            <div class="h-10 align-items-center justify-content-start">
                <div style="background: lightgray">
                    <img id="loader1" style="display: none;" src="https://www.aspsnippets.com/demos/loader.gif" alt="" />
                </div>
            </div>
            <asp:Button ID="BtnExportToExcel" CssClass="btn btn-info btn-outline-success"
                OnClientClick="showLoader1();"
                runat="server" Text="Export To Excel" OnClick="BtnExportToExcel_Click" />
        </div>
    </div>
</div>

protected void BtnExportToExcel_Click(object sender, EventArgs e)
{
    System.Threading.Thread.Sleep(7000);
    //==============================================
    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment;filename=ExchangeRateHistory.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.ms-excel";
    using (StringWriter sw = new StringWriter())
    {
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        //To Export all pages
        GvExchangeRate.AllowPaging = false;
        //this.LoadAllList();
        GvExchangeRate.HeaderRow.BackColor = Color.White;

        foreach (TableCell cell in GvExchangeRate.HeaderRow.Cells)
        {
            //cell.BackColor = GvPaymentStatus.HeaderStyle.BackColor;
            cell.ForeColor = Color.Black;
            cell.Font.Bold = true;
            cell.Font.Size = 12;
            cell.BackColor = Color.LightCyan;
        }
        foreach (GridViewRow row in GvExchangeRate.Rows)
        {
            row.BackColor = Color.White;
            row.Font.Size = 10;
            foreach (TableCell cell in row.Cells)
            {
                if (row.RowIndex % 2 == 0)
                {
                    cell.BackColor = GvExchangeRate.AlternatingRowStyle.BackColor;
                }
                else
                {
                    cell.BackColor = GvExchangeRate.RowStyle.BackColor;
                }
                cell.CssClass = "textmode";

            }
        }

        GvExchangeRate.RenderControl(hw);

        //style to format numbers to string
        string style = @"<style> .textmode { mso-number-format:\@; } </style>";
        Response.Write(style);
        Response.Output.Write(sw.ToString());
        Response.Flush();
        Response.End();
    }
}

// End export to excel
public override void VerifyRenderingInServerForm(Control control)
{
    /* Verifies that the control is rendered */
}