Progress bar for crystal report ASP.NET VS2019

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C#

ASP.NET

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I'm using Crystal Report SP26. VS2019 C# and ASP.NET WEBFORMS
I want to show progress bar while query executing.
I'm executing crystal report on PDF.
I really don't have an idea. The samples I encountered here is for winforms.

Below are the only codes I have. Please help thanks.

What I have tried:

ReportDocument rptdoc = new ReportDocument();

private void LoadReports()
        {


            using (ReportServicesClient rptservices = new ReportServicesClient())
            {
              if (Session["ReportID"].Equals(2))
                {

                    COE coe = new COE();
                    coe.PersonID = Convert.ToInt32(Session["PersonID"]);
                    DataTable dt = rptservices.GetCertificateOfEmployment(coe);                   
                    string reportname = @"\Reports\Certificates\CertificateOfEmployment.rpt";

                    rptdoc.Load(Server.MapPath(reportname));

                    rptdoc.DataSourceConnections.Clear();
                    rptdoc.SetDataSource(dt);
                    rptdoc.ExportToHttpResponse(ExportFormatType.PortableDocFormat, HttpContext.Current.Response, false,"" )");
                }
	   }
}