byte[] byteSI = p.GenerateReportBinary();

            //2.
            string filename = Server.MapPath("~/Temp/SI_TermTakaful.pdf");
            File.WriteAllBytes(filename, byteSI);

            Session["PdfUrl"] = byteSI;

            ScriptManager.RegisterStartupScript(this, GetType(), "Show Modal Popup", "showmodalpopup();", true);

if (Session["PdfUrl"] != null)
                {
                    string filename = Session["PdfUrl"].ToString();

                    Context.Response.Buffer = false;
                    FileStream inStr = null;
                    byte[] buffer = new byte[1024];
                    long byteCount; inStr = File.OpenRead(filename);
                    while ((byteCount = inStr.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        if (Context.Response.IsClientConnected)
                        {
                            Response.ContentType = "application/pdf";
                            Context.Response.OutputStream.Write(buffer, 0, buffer.Length);
                            Context.Response.Flush();
                        }
                    }

                }
}