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using System;
using System.Collections.Generic;
using System.IO;

namespace TestFile
{
   
    public class User
    {
        public User(int idUser, string login, string password, string email)
        {
            this.IdUser = idUser;
            this.Login = login;
            this.Password = password;
            this.Email = email;
        }

        public int IdUser { get; set; }
        public string Login { get; set; }
        public string Password { get; set; }
        public string Email { get; set; }

        public override string ToString()
        {
            return $"{this.IdUser}: {this.Login} {this.Password} @ {this.Email}";
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            List<User> users = new List<User>
            {
                new User(1, "James", "007", "bond@mi6.uk"),
                new User(2, "Jason", "treadstone", "bourne@cia.us"),
                new User(3, "Hubert", "oss117", "bonisseur-de-la-bath@espions.fr")
            };

            string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string fullPath = Path.Combine(docPath, "WriteLines.txt");

            using (StreamWriter outputFile = new StreamWriter(fullPath))
            {
                string separator = "+------------+----------------------+----------------------+---------------------------------+";
                outputFile.WriteLine(separator);
                outputFile.WriteLine("| {0,-10} | {1,-20} | {2,-20} | {3,31} |", "Identifier", "Login", "Password", "Email");
                outputFile.WriteLine(separator);
                foreach(User user in users)
                {
                    outputFile.WriteLine($"| {user.IdUser, -10} | {user.Login,-20} | {user.Password,-20} | {user.Email,31} |");
                }
                outputFile.WriteLine(separator);
            }

        }
    }
}

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using System;
using System.IO;
using System.Text.RegularExpressions;

namespace TestFile
{
   
    class Program
    {
        static void Main(string[] args)
        {
            string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string fullPath = Path.Combine(docPath, "WriteLines.txt");

            // Cette expression régulière permet de reconnaître le format d'un email.
            Regex emailEx = new Regex(@"[a-zA-Z0-9._-]+@[\w.-]+\.[a-zA-Z]{2,}", RegexOptions.Compiled);

            string line;
            using (StreamReader stream = new StreamReader(fullPath))
            {
                // On lit les lignes une à une.
                while ((line = stream.ReadLine()) != null)
                {
                    // Si la ligne de texte contient des emails, on les affiche.
                    MatchCollection results = emailEx.Matches(line);
                    foreach (Match m in results)
                    {
                        Console.WriteLine(m.Groups[0]);
                    }

                }
            }
        }
    }
}