int chunkSize = 6;
  string my_string= readerPicture["DAB_Dane"]ToString();
  System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
  var as_binary = encoding.GetBytes(my_string);
  Stream stream = new MemoryStream(as_binary);
  BinaryReader rdr = new BinaryReader(stream);
    int streamLength = (int)rdr.BaseStream.Length;
   var sb = new StringBuilder();

   while (rdr.BaseStream.Position < streamLength)
                                                                {
                                                                    byte[] b = new byte[chunkSize];

                                                                    long remaining = streamLength - rdr.BaseStream.Position;
                                                                    if (remaining >= chunkSize)
                                                                    {
                                                                        rdr.Read(b, 0, chunkSize);
                                                                    }
                                                                    else
                                                                    {
                                                                        rdr.Read(b, 0, (int)remaining);
                                                                    }
                                                                    string chunkString = Convert.ToBase64String(b);

                                                                    // Lets assume we send it and it's received on the other side
                                                                    sb.Append(chunkString);
                                                                }
                                                                sqlData.pictureName = readerPicture["DAB_Nazwa"].ToString();
                                                                // This should happen on your receiving side as well
                                                                var other_side = sb.ToString(); // value => SGVsbG8gd29ybGQh

                                                                // Back into byte array
                                                                var byte_from_64 = Convert.FromBase64String(other_side);
                                                                // Back into string. Will hold "Hello World!"
                                                                var string_from_byte = encoding.GetString(byte_from_64);

                                                                sqlData.pictureCode = byte_from_64;


                                                                SendProductTo(listProduct, sqlDataProducts);

                                                            }
                                                        }