How to Disable the Menubar or save as option file menu in Generated pdf file while Downloading in asp.net

using (MemoryStream input = new MemoryStream(renderedBytes))
                {
                    using (MemoryStream output = new MemoryStream())
                    {
                        PdfReader reader = new PdfReader(input);
                        reader.AddViewerPreference(PdfName.HIDEMENUBAR, PdfName.NONE);
                        // PdfEncryptor.Encrypt(reader, output, true, CertificatePassword, CertificatePassword, PdfWriter.ALLOW_SCREENREADERS);
                        PdfEncryptor.Encrypt(reader, output, true, null, null, PdfWriter.ALLOW_PRINTING | PdfWriter.AllowPrinting | PdfWriter.ENCRYPTION_AES_128 | PdfWriter.CenterWindow);
                        renderedBytes = output.ToArray();
                        Response.ContentType = "application/pdf";
                        // Response.AddHeader("content-disposition", "inline;filename=" + reportname + "." + fileNameExtension + "#menubar=0;");
                        //Response.AddHeader("content-disposition", "<embed src=" + reportname + "." + fileNameExtension + "'#toolbar=0&scrollbar=0&navpanes=0'");
                        Response.AddHeader("content-disposition", "attachment;filename=" + reportname + "." + fileNameExtension);
                        // Response.Cache.SetCacheability(HttpCacheability.NoCache);
                        Response.BinaryWrite(renderedBytes);
                        Response.Flush();
                        Response.Close();
                        //string WorkingFolder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
                        //string InputFile = Path.Combine(WorkingFolder, "StickerSheet_New.pdf");
                        //string OutputFile = Path.Combine(WorkingFolder, "2.pdf");
                        //      using (Stream input = new FileStream(InputFile, FileMode.Open, FileAccess.Read, FileShare.Read))
                        //      {
                        //          using (Stream output = new FileStream(OutputFile, FileMode.Create, FileAccess.Write, FileShare.None))
                        //          {

                        //              PdfReader reader = new PdfReader(input);
                        //              //PdfEncryptor.Encrypt(reader, output, true, "23!54", "23!54", PdfWriter.ALLOW_SCREENREADERS);               
                        //              System.Text.UTF8Encoding Encoding = new System.Text.UTF8Encoding();

                        //              PdfStamper stamper = new PdfStamper(reader, output);
                        //              stamper.SetEncryption(Encoding.GetBytes("23!54"), null, PdfWriter.AllowScreenReaders, PdfWriter.STRENGTH40BITS );
                        //              //output.ViewerPreferences.HideToolbar = true;
                        //              //PdfReader pReader = new PdfReader();
                        //              //PdfEncryptor.Encrypt(reader, new FileStream("1.pdf", FileMode.Open), PdfWriter.STRENGTH128BITS, "23!54", null, PdfWriter.AllowScreenReaders);
                        //              stamper.Close();
                        //              reader.Close();
                        //              Response.Write("PDF created");
                        //          }
                        //      }
                        //  }

                        //}

                    }
                }



here this same code for more clarity

      using (MemoryStream input = new MemoryStream(renderedBytes))
                {
                    using (MemoryStream output = new MemoryStream())
                    {
                        PdfReader reader = new PdfReader(input);                       
                        PdfEncryptor.Encrypt(reader, output, true, null, null, PdfWriter.ALLOW_PRINTING | PdfWriter.AllowPrinting | PdfWriter.ENCRYPTION_AES_128 | PdfWriter.CenterWindow|PdfWriter.HideMenubar);
                        renderedBytes = output.ToArray();
                        Response.ContentType = "application/pdf";
                        Response.AddHeader("content-disposition", "attachment;filename=" + reportname + "." + fileNameExtension);                     
                        Response.BinaryWrite(renderedBytes);
                        Response.Flush();
                        Response.Close();

                    }
                }