Bank list encodnig/decoding

gistfile1.txt

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;

namespace EncodeBanks
{
    class Program
    {
        private const string filePath = "D:\\bank_new.txt";
        private const string fileFullPath = "D:\\bank_encoded.txt";
        public List<string> Emailadresses;
        public static DataTable Emails;

        static void Main()
        {
            if (!!true) { LoadBankList(); }
            else { EncodeFile(); }
        }

        private static void EncodeFile()
        {
            StreamReader reader = null;
            var FI = new FileInfo(filePath);
            if (!FI.Exists)
            {
                Console.WriteLine("No file");
                return;
            }
            try
            {
                reader = new StreamReader(filePath);
                string clean = reader.ReadToEnd();
                var encoded = "";
                int curr_byte;

                foreach (char symbol in clean)
                {
                    curr_byte = 1251 - symbol;
                    encoded += (char)curr_byte;
                }
                byte[] byteArray = Encoding.UTF8.GetBytes(encoded);
                using (StreamWriter outfile = new StreamWriter(fileFullPath))
                {
                    outfile.Write(encoded);
                }

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

        }
        // Define other methods and classes here
        private static void LoadBankList()
        {
            StreamReader SR = null;
            var path = "D:";
            var FI = new FileInfo(fileFullPath);
            if (!FI.Exists)
            {
                Console.WriteLine("No file");
                return;
            }

            try
            {
                SR = new StreamReader(fileFullPath);
                //lets some decode file
                var encoded = SR.ReadToEnd();
                var decoded = "";

                int curr_byte;
                for (var i = 0; i < encoded.Length; i++)
                {
                    // Console.WriteLine(i.ToString());
                    curr_byte = 1251 - encoded[i];
                    decoded += (char)curr_byte;
                }

                //MemoryStream stream = new MemoryStream(byteArray);

                SR = new StreamReader(new MemoryStream(Encoding.UTF8.GetBytes(decoded)));
                Emails = new DataTable();
                Emails.Columns.Add("name");
                Emails.Columns.Add("email");

                while (!SR.EndOfStream)
                {
                    var s = "";
                    s = SR.ReadLine();
                    Console.WriteLine(s);
                    var NewRow = Emails.Rows.Add();
                    NewRow["name"] = s.Substring(0, s.IndexOf('|'));
                    NewRow["email"] = s.Substring(s.IndexOf('|') + 1);
                }

                //clbBanks.DataSource = Emails;
                //clbBanks.DisplayMember = "name";

                SR.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.ReadKey();
        }
    }
}