int register, g;
            Console.WriteLine("Input number of users:");
            register = int.Parse(Console.ReadLine());
            string[] user = new string[register];
            string[] pw = new string[register];
            bool[] add = new bool[register];

            do
            {
                for (int i = 0; i < register; i++)
                {
                    Console.WriteLine("Please enter the user's name:");
                    user[i] = Console.ReadLine();
                    Console.WriteLine("Please enter the user's password");
                    pw[i] = Console.ReadLine();

                    Console.WriteLine("User " + user[i] + " has been registered at index of " + i);

                }

                do
                {
                    Console.WriteLine("******");
                    Console.WriteLine("Please test a few of the user's accounts");
                    Console.WriteLine("Enter the user's username:");
                    string enter = Console.ReadLine();
                    Console.WriteLine("Enter the user's password:");
                    string enterpw = Console.ReadLine();


                    if (user.Any(enter.Contains) && pw.Any(enterpw.Contains))
                    {
                        Console.WriteLine("User login successful at index of " + Array.IndexOf(user, enter));

                    }
                    else
                    {
                        Console.WriteLine("User not found!");
                    }

                    Console.WriteLine("Try Again?");
                    Console.WriteLine("1 - Yes      2 - No");
                    g = int.Parse(Console.ReadLine());

                }
                while (g == 1);

                break;

            }
            while (0 <= register);

            Console.ReadKey();