exemple on how to create a CSV file

ExportCSV.cs

public void ExportCSV()
        {
            string[] tableNames =
            {
                "especialidade", "participante", "perfil",
                "pergunta", "resposta", /*"questao",*/"quiz",
                "setor", "tecnologia", "treinamento", "empresa"
            };

            using (IDbConnection dbcon = new SqliteConnection(DataManager.Instance.Connection))
            {
                dbcon.Open();

                string directory = Application.persistentDataPath + "/export_" + DateTime.Now.Ticks + "/";

                foreach (string table in tableNames)
                {
                    try
                    {
                        //create directory
                        string fileFullPath =  directory + table + ".csv";
                        Directory.CreateDirectory(Path.GetDirectoryName(fileFullPath));

                        IDbCommand cmnd_read = dbcon.CreateCommand();
                        cmnd_read.CommandText = "select * from " + table;
                        IDataReader reader = cmnd_read.ExecuteReader();

                        StringBuilder sbHeader = new StringBuilder();
                        for (var i = 0; i < reader.FieldCount; i++)
                        {
                            sbHeader.Append(reader.GetName(i) + ",");
                        }

                        sbHeader.Remove(sbHeader.Length - 1, 1);

                        using (FileStream fileStream = new FileStream(fileFullPath, FileMode.Append, FileAccess.Write))
                        using (StreamWriter streamWriter = new StreamWriter(fileStream))
                        {
                            //write head
                            streamWriter.WriteLine(sbHeader.ToString());

                            //write content
                            while (reader.Read())
                            {
                                StringBuilder sbContent = new StringBuilder();
                                for (int i = 0; i < reader.FieldCount; i++)
                                {
                                    string appender = "";
                                    //check if is base64 and decode
                                    // if (Regex.IsMatch(appender,"^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$"))
                                    if(table == "participante" && reader.GetName(i).Equals("email"))
                                    {
                                        appender = Encryptor.Base64Decode(reader[i].ToString());
                                    }
                                    else
                                    {
                                        appender = reader[i].ToString();
                                    }
                                    appender = '\"' + appender + '\"';

                                    //grab relevant tag data and set the csv line for the current row.
                                    sbContent.Append(appender + ",");
                                }

                                sbContent.Remove(sbContent.Length - 1, 1);
                                streamWriter.WriteLine(sbContent.ToString());
                            }
                        }

                    }
                    catch (Exception ex)
                    {
                        Debug.LogError(ex.Message + ex.StackTrace);
                    }
                }
                ExternalApp.OpenExplorer(directory);
            }

        }