using System;

​

public class MyProgram

{

    private static Random random = new Random();

    public static void Main(String[] args)

    {

        String[] userNames = new String[5];

        int[] passwords = new int[5];

        int attempts;

        int index;

        Boolean Right;

        String userName;

        int password;

        Console.WriteLine("Username,Passwords");

        for (index = 0 ; index <= userNames.Length - 1 ; index += 1)

        {

            userNames[index] = userNames[index]+ (char) (random.Next(25) + 65);

            userNames[index] = userNames[index] + (char) (random.Next(25) + 65);

            userNames[index] = userNames[index] + (char) (random.Next(25) + 65);

            passwords[index] = random.Next(900) + 100;

            Console.WriteLine(userNames[index] + "," + passwords[index]);

        }

        attempts = 3;

        Right = false;

        while (attempts > 0 && Right == false)

        {

            Console.WriteLine("Please enter you username: ");

            input(out userName);

            Console.WriteLine("Please enter your password ");

            input(out password);

            index = 0;

            while (index < userNames.Length && Right == false)

            {

                if (userNames[index] == userName && passwords[index] == password)

                {

                    Right = true;

                }

                else

                {

                    index = index + 1;

                }

            }

            attempts = attempts - 1;

            if (attempts > 0 && Right == false)

            {

                Console.WriteLine("Sorry. Access denied");

            }

        }

        if (Right)

        {

            Console.WriteLine("Welcome to the system.");

        }

        else

        {

            Console.WriteLine("Sorry acess denied");

        }

    }

    // .NET can only read single characters or entire lines from the console.

    // The following functions are designed to help input specific data types.

    private static void input(out double result)

    {

        while (!double.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out int result)

    {

        while (!int.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out Boolean result)

    {

        while (!Boolean.TryParse(Console.ReadLine(), out result));

    }

    private static void input(out string result)

    {

        result = Console.ReadLine();

    }

}

​