Hide Ajax UpdateProgress loader image after Response.End in ASP.Net

Hi Poonam123,

Response.End sends all currently buffered output to the client and stops execution of the page.

So you need to do it in new page.

Check this example. Now please take its reference and correct your code.

HTML

<style type="text/css">
    .overlay
    {
        position: fixed;
        z-index: 999;
        height: 100%;
        width: 100%;
        top: 0;
        background-color: Black;
        filter: alpha(opacity=60);
        opacity: 0.6;
        -moz-opacity: 0.8;
    }
</style>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdateProgress ID="UpdateProgress1" runat="server" AssociatedUpdatePanelID="up11">
    <ProgressTemplate>
        <div class="overlay">
            <div style="z-index: 1000; margin-left: 35%; margin-top: 300px; opacity: 1; -moz-opacity: 1;">
                <img alt="" src="loader.gif" />
            </div>
        </div>
    </ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="up11" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <asp:Button ID="downloadformat" runat="server" Text="Download Format" CssClass="btn btn-success"
            OnClick="downloadformat_Click" OnClientClick="showProgress()" />
    </ContentTemplate>
    <Triggers>
        <asp:PostBackTrigger ControlID="downloadformat" />
    </Triggers>
</asp:UpdatePanel>
<script type="text/javascript">
    function showProgress() {
        var updateProgress = $find("<%= UpdateProgress1.ClientID %>");
        window.setTimeout(function () {
            updateProgress.set_visible(true);
        }, 100);
    }
</script>

Code

Default

C#

protected void downloadformat_Click(object sender, EventArgs e)
{
    ScriptManager.RegisterStartupScript(this, typeof(string), "OpenWindow", "window.open('Download.aspx', null, 'height=700,width=760,status=yes,toolbar=no,scrollbars=yes,menubar=no,location=no');", true);
}

VB.Net

Protected Sub downloadformat_Click(ByVal sender As Object, ByVal e As EventArgs)
    ScriptManager.RegisterStartupScript(Me, GetType(String), "OpenWindow", "window.open('Download.aspx', null, 'height=700,width=760,status=yes,toolbar=no,scrollbars=yes,menubar=no,location=no');", True)
End Sub

Download

C#

protected void Page_Load(object sender, EventArgs e)
{
    System.IO.FileInfo file = new System.IO.FileInfo(Server.MapPath("~/Uploads/Excel03.xls"));
    if (file.Exists)
    {
        Response.Clear();
        Response.AddHeader("Content-Disposition", "attachment; filename=Excel03.xls");
        Response.AddHeader("Content-Length", file.Length.ToString());
        Response.ContentType = "application/ms-excel";
        Response.WriteFile(file.FullName);
        Response.Flush();
        Response.End();
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim file As System.IO.FileInfo = New System.IO.FileInfo(Server.MapPath("~/Uploads/Excel03.xls"))
    If file.Exists Then
        Response.Clear()
        Response.AddHeader("Content-Disposition", "attachment; filename=Excel03.xls")
        Response.AddHeader("Content-Length", file.Length.ToString())
        Response.ContentType = "application/ms-excel"
        Response.WriteFile(file.FullName)
        Response.Flush()
        Response.End()
    End If
End Sub