After downloading file the loading screen it does not close ASP NET C#

Question

User-1453200658 posted

Hi,

I have add a Button in GridView

<asp:ScriptManager runat="server" />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:BoundField DataField="Name" />
        <asp:TemplateField HeaderText="" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
                <asp:HiddenField ID="hfCountry" runat="server" Value='<%# Eval("Country") %>' />
                <asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="UpdatePanel1">
                    <ProgressTemplate>
                        <div class="modal">
                            <div class="center">
                                <img alt="" src="progress.gif" />
                            </div>
                        </div>
                    </ProgressTemplate>
                </asp:UpdateProgress>
                <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="Link" EventName="Click" />
                    </Triggers>
                    <ContentTemplate>
                        <asp:Button ID="Link" runat="server" Text="Download" OnClick="OnDownload" CssClass="buttonLink" />
                    </ContentTemplate>
                </asp:UpdatePanel>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<style type="text/css">
    body {
        margin: 0;
        padding: 0;
        font-family: Arial;
    }
 
    .modal {
        position: fixed;
        left: 0;
        z-index: 999;
        height: 100%;
        width: 100%;
        top: 0;
        background-color: Black;
        filter: alpha(opacity=60);
        opacity: 0.6;
        -moz-opacity: 0.8;
    }
 
    .center {
        z-index: 1000;
        margin: 30px auto;
        padding: 10px;
        width: 130px;
        background-color: White;
        border-radius: 10px;
        filter: alpha(opacity=100);
        opacity: 1;
        -moz-opacity: 1;
    }
 
        .center img {
            height: 128px;
            width: 128px;
        }
 
    .buttonLink {
        background: none !important;
        border: none;
        padding: 0 !important;
        font-family: arial, sans-serif;
        color: #069;
        text-decoration: underline;
        cursor: pointer;
    }
</style>

On the OnDownload I set that will navigate to the next form in the website for export xls file

protected void OnDownload(object sender, EventArgs e)
{
    Button btn = (Button)sender;
    GridViewRow row = btn.NamingContainer as GridViewRow;
 
    string ese = (row.FindControl("hfCountry") as HiddenField).Value;
 
    if (!string.IsNullOrEmpty(ddl.SelectedValue))
    {
        Response.Redirect("xls.aspx?e=" + ese.ToString() + "&a=" + ddl.SelectedValue);
    }
    else
    {
        Response.Redirect("xls.aspx?e=" + ese.ToString());
    }
}

With this code my problem is after downloading the excel file from the page xls.aspx my loading screen it does not close and remains fixed on the browser...

How to do resolve this?

Thanks in advance for any help