[Solved] Loading progress does not close after file download in ASP.Net

Hi,

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

I have add a Button in GridView

Thanks in advance for any help

<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());
    }
}