public static bool writeLineUser(String pathFile, List <User> content, bool flag)
        {
            System.IO.FileStream fs;
            if (!File.Exists(pathFile))
            {
                var directory = Directory.CreateDirectory(Path.GetDirectoryName(pathFile));
                fs = new System.IO.FileStream(pathFile, System.IO.FileMode.CreateNew);
            }
            else
            {
                fs = new System.IO.FileStream(pathFile, System.IO.FileMode.Append);
            }

            using (StreamWriter streamWriter = new StreamWriter(fs))
            {
                try
                {
                    for (int i = 0; i < content.Count; i++)
                    {
                        streamWriter.WriteLine(ConvertUserAndString.convertUserToString(content[i]));
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                    return(false);
                }
            }
            return(true);
        }
        public static List <User> readLineUser(String pathFile)
        {
            if (!File.Exists(pathFile))
            {
                return(null);
            }

            List <User> content = new List <User>();

            try
            {
                using (StreamReader streamReader = File.OpenText(pathFile))
                {
                    string item = "";
                    User   user;
                    while ((item = streamReader.ReadLine()) != null)
                    {
                        user = ConvertUserAndString.convertStringToUser(item);
                        content.Add(user);
                    }
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return(new List <User>());
            }

            return(content);
        }