[VP] Password Strength

using System;

namespace Lab15
{
    enum PasswordStrength : byte
    {
        easy = 1,
        normal = 2,
        hard = 3
    }
    class Program
    {
        public static String GeneratePassword(PasswordStrength passwordStrength)
        {
            if ((int)passwordStrength == 1)
            {
                Random random = new Random();

                int length= random.Next(1, 6);
                char[] password = new char[length];

                char[] easy = "abcdefghijklmnopqrstuvwxyz".ToCharArray();

                for (int i = 0; i < length; i++)
                {
                    password[i] = easy[random.Next(0, 25)];
                }

                Console.WriteLine("Generated Easy Password.");
                String pw = new string(password);
                return pw;
            }

            else if ((int)passwordStrength == 2)
            {
                Random random = new Random();

                int length = random.Next(6, 10);
                char[] password = new char[length];

                char[] normal = "abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();

                for (int i = 0; i < length; i++)
                {
                    password[i] = normal[random.Next(0, 61)];
                }
                Console.WriteLine("Generated Normal Password.");
                String pw = new string(password);
                return pw;
            }

            else if ((int)passwordStrength == 3)
            {
                Random random = new Random();

                int length = random.Next(10, 20);
                char[] password = new char[length];

                char[] hard = "$%#@!*abcdefghijklmnopqrstuvwxyz1234567890?;:ABCDEFGHIJKLMNOPQRSTUVWXYZ^&".ToCharArray();

                for (int i = 0; i < length; i++)
                {
                    password[i] = hard[random.Next(0, 72)];
                }
                Console.WriteLine("Generated Hard Password.");
                String pw = new string(password);
                return pw;
            }
            else
            {
                Console.WriteLine("You done messed up");
                String empty = null;
                return empty;
            }
        }

        static void Main(string[] args)
        {
            int n;
            Console.WriteLine("Enter Number for Password Strength for Random Generated Password: ");
            Console.WriteLine("1 = Easy; \n2 = Normal; \n3 = Hard.");
            n = Convert.ToInt16(Console.ReadLine());
            PasswordStrength N = (PasswordStrength)n;
            String generatedPassword = GeneratePassword(N);

            Console.WriteLine("Generated password = '{0}' ", generatedPassword);

            Console.WriteLine("Enter your guesses for what the password 'might' be.");

            String s = Console.ReadLine();
            String[] guesses = s.Split(' ');
            int counter = 0;

            for(int i = 0; i < guesses.Length; i++)
            {
                if (guesses[i].Equals(generatedPassword))
                {
                    counter=1;
                }
            }

            if (counter == 1)
                Console.WriteLine("You have eyes.");
            else if(counter == 0)
                Console.WriteLine("You are blind");

            Console.ReadKey();
        }
    }
}