using System;

​

namespace ConsoleApp48

{

    class Program

    {

            static void Main(string[] args)

            {

                var arrUsers = new Users[]

                {

                new Users("tomas", "samsung", 2605),

                new Users("stefan", "pasle", 15),

                new Users("dimitar", "jovanov", 32)

                };

​

            Start:

                Console.WriteLine("zum einloggen 1 zum registrieren 2");

                var input = Console.ReadLine();

​

​

​

                bool successfull = false;

                while (!successfull)

                {

​

                    if (input == "1")

                    {

                        Console.WriteLine("Write your username:");

                        var username = Console.ReadLine();

                        Console.WriteLine("Enter your password:");

                        var password = Console.ReadLine();

​

​

                        foreach (Users user in arrUsers)

                        {

                            if (username == user.username && password == user.password)

                            {

                                Console.WriteLine("You have successfully logged in !!!");

                                Console.ReadLine();

                                Console.Clear();

                                successfull = true;

​

​

                                Console.Write("Welcome " + user.username + " ");

​

                            }

                        }

​

​

                        if (!successfull)

                        {

                            Console.WriteLine("Your username or password is incorect, try again !!!");

                        }

​

                    }

​

                    else if (input == "2")

                    {

​

                        Console.WriteLine("Enter your username:");

                        var username = Console.ReadLine();

​

                        Console.WriteLine("Enter your password:");

                        var password = Console.ReadLine();

​

                        Console.WriteLine("Enter your id:");

                        int id = int.Parse(Console.ReadLine());

​

​

                        Array.Resize(ref arrUsers, arrUsers.Length + 1);

                        arrUsers[arrUsers.Length - 1] = new Users(username, password, id);

                        successfull = true;

                        goto Start;

​

                    }

                    else

                    {

                        Console.WriteLine("Try again !!!");

                        break;

​

​

                    }

​

                }

​

            }

        }

    }

​

    public class Users

    {

        public string username;

        public string password;

        private int id;

​

        public Users(string username, string password, int id)

        {

            this.username = username;

            this.password = password;

            this.id = id;

        }

    }

​