=iif(Max(Fields!customeremail.Value, "proc_id_group")="","","&$#!"+Str(Fields!proc_id.Value)+"%"+
System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(Max(Fields!customeremail.Value, "proc_id_group")))+"%"+
System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(Iif(Max(Fields!emailsubj.Value, "proc_id_group")="","(без темы)",
Replace(
  Replace(
    Replace(
      Replace(
        Replace(
          Replace(
            Replace(
              Replace(
                     Max(Fields!emailsubj.Value, "proc_id_group"),
                "%к",Max(Fields!customername.Value, "proc_id_group"),
              ),"%п",Max(Fields!companyname.Value, "proc_id_group"),
            ),  "%л",Max(Fields!externalcontractid.Value, "proc_id_group"),
          ),    "%р",Choose(Max(Fields!repmonth.Value, "proc_id_group"),
                 "январь", "февраль", "март", "апрель", "май", "июнь", "июль", "август", "сентябрь", "октябрь", "ноябрь", "декабрь"
                 ) + " " + CStr(Max(Fields!repyear.Value, "proc_id_group")),
        ),      "%о",FormatDateTime(Max(Fields!duedate.Value, "proc_id_group"), DateFormat.ShortDate),
      ),        "%н",FormatNumber(Max(Fields!dr_amt.Value, "proc_id_group")+Max(Fields!rc_amt.Value, "proc_id_group"),2)
    ),          "%з",FormatNumber(Max(Fields!ou_amt.Value, "proc_id_group"),2)
  ),            "%%", "%")
)))+"%"+System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(Iif(IsNothing(Max(Fields!emailbody.Value, "proc_id_group")),"(без тела)",
Replace(
  Replace(
    Replace(
      Replace(
        Replace(
          Replace(
            Replace(
              Replace(
                     Max(Fields!emailbody.Value, "proc_id_group"),
                "%к",Max(Fields!customername.Value, "proc_id_group"),
              ),"%п",Max(Fields!companyname.Value, "proc_id_group"),
            ),  "%л",Max(Fields!externalcontractid.Value, "proc_id_group"),
          ),    "%р",Choose(Max(Fields!repmonth.Value, "proc_id_group"),
                         "январь", "февраль", "март", "апрель", "май", "июнь", "июль", "август", "сентябрь", "октябрь", "ноябрь", "декабрь"
                          ) + " " + CStr(Max(Fields!repyear.Value, "proc_id_group")),
        ),      "%о",FormatDateTime(Max(Fields!duedate.Value, "proc_id_group"), DateFormat.ShortDate),
      ),        "%н",FormatNumber(Max(Fields!dr_amt.Value, "proc_id_group")+Max(Fields!rc_amt.Value, "proc_id_group"),2)
    ),          "%з",FormatNumber(Max(Fields!ou_amt.Value, "proc_id_group"),2)
  ),            "%%", "%")
)))+"&$#!")

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int rc = 0;
            if (args.Length != 3)
            {
                Console.WriteLine("Usage: pdf_to_e-mail_splitter.exe smtp-server[:port] sender-e-mail PDF-file-to-parse");
                Environment.Exit(12);
            }

            try
            {
                rc=parse_file(args[0], args[1], args[2]);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error parsing input PDF file {0}. {1}", args[2], ex.ToString());
                Environment.Exit(16);
            }
            Environment.Exit(rc);
        }

        static int parse_file(string smtpServer, string emailFrom, string fname)
        {
            int rc = 0;
            PdfReader reader = new PdfReader(fname);
            Document document = null;
            PdfCopy copy = null;
            string pagePath = null;
            string rawPage;
            SmtpClient client;
            string[] decoded = null;
            string proc_id = "";

            ServicePointManager.ServerCertificateValidationCallback =
                delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)  { return true; };
            
            string[] smtpName = smtpServer.Split(':');
            if (smtpName.Length > 1)
            {
                client = new SmtpClient(smtpName[0], Convert.ToInt32(smtpName[1]));
                client.EnableSsl = true;
                client.Credentials = CredentialCache.DefaultNetworkCredentials;
                client.UseDefaultCredentials = true;
                Console.WriteLine("Connecting to SMTP with SSL");
            }
            else
            {
                client = new SmtpClient(smtpName[0]);
                client.EnableSsl = false;
                Console.WriteLine("Connecting to SMTP without SSL and authentication");
            }
            client.DeliveryFormat = SmtpDeliveryFormat.International;

            for (int pageNo = 1; pageNo <= reader.NumberOfPages; pageNo++)
            {
                rawPage = PdfTextExtractor.GetTextFromPage(reader, pageNo);
                try
                {
                    decoded = parse_page(rawPage);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("[Page {0} skipped: {1}] ", pageNo, ex.Message);
                    continue;
                }

                if (decoded[0] != proc_id)
                {
                    Console.WriteLine("Page {0} decoded as document No{1} for e-mail address {2}", pageNo, decoded[0], decoded[1]);
                    if (proc_id != "")
                    {
                        document.Close();
                        document.Dispose();
                        MailMessage message = new MailMessage(emailFrom, decoded[1], decoded[2], decoded[3]);
                        Attachment data = new Attachment(pagePath, MediaTypeNames.Application.Pdf);
                        message.Attachments.Add(data);
                        try
                        {
                            client.Send(message);
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("Exception caught in SmtpClient.Send: {0}", ex.ToString());
                            rc = 4;
                        }
                        data.Dispose();
                        message.Dispose();
                        File.Delete(pagePath);
                    }

                    pagePath = System.IO.Path.GetTempPath() + System.IO.Path.GetFileNameWithoutExtension(fname) + "_page.PDF";
                    document = new Document();
                    copy = new PdfCopy(document, new FileStream(pagePath, FileMode.Create));
                    document.Open();
                    copy.AddPage(copy.GetImportedPage(reader, pageNo));
                }
                else
                {
                    Console.WriteLine("Page {0} decoded as document No{1} and appended for e-mail address {2}", pageNo, decoded[0], decoded[1]);
                    copy.AddPage(copy.GetImportedPage(reader, pageNo));
                }
                proc_id = decoded[0];
            }
            if (proc_id != "")
            {
                document.Close();
                document.Dispose();
                MailMessage message = new MailMessage(emailFrom, decoded[1], decoded[2], decoded[3]);
                Attachment data = new Attachment(pagePath, MediaTypeNames.Application.Pdf);
                message.Attachments.Add(data);
                try
                {
                    client.Send(message);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception caught in SmtpClient.Send: {0}", ex.ToString());
                    rc = 4;
                }
                data.Dispose();
                message.Dispose();
                File.Delete(pagePath);
            }
            return (rc);
        }

        static string[] parse_page(string page_raw)
        {
            string[] decoded = new string[4];;
            int from = page_raw.IndexOf("&$#!");
            if (from < 0) throw new ArgumentException("Label &$#! not found");
            int to = page_raw.IndexOf("&$#!",from+4);
            if (to < 0) throw new ArgumentException("Label &$#! found only once");
            string found = page_raw.Substring(from + 4, to - 4);
            string[] parsed = found.Split('%');
            if (parsed.Length != 4) throw new ArgumentException("Delimiter % must exist only two times");
            for (int i=0; i<4; i++ )
            {
                decoded[i] = (i==0) ? parsed[i] : Encoding.UTF8.GetString(Convert.FromBase64String(parsed[i]));
            }
            return decoded;
        }
    }
}