MD5 Accounts program

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Security;
using System.Security.Cryptography;
using System.Net;
using System.Text.RegularExpressions;

namespace md5Generator
{
    class Program
    {
        static string[] fUsr;
        static string nUsr;
        static string[] cHash;
        static string nHash;
        static bool log = false;
        static int lineFound;
        static string cPassHash;
        static string usrAddr= "C:\\Users\\atlan\\Documents\\accs\\usrs.txt";
        static string lstAddr = "C:\\Users\\atlan\\Documents\\accs\\lst.txt";
        static string usrsFile = System.IO.File.ReadAllText("C:\\Users\\atlan\\Documents\\accs\\usrs.txt");
        static string lstFile = System.IO.File.ReadAllText("C:\\Users\\atlan\\Documents\\accs\\lst.txt");
        static string nWrd;
        static string uname;
        static string pword;
        static void Main(string[] args)
        {
            Console.Title = "MD5 Accounts program - By smoc";
            existCheck("");
            Console.ForegroundColor = ConsoleColor.White;
            while (true)
            {
                if (log == false)
                {
                    Console.WriteLine("1. Create account.");
                    Console.WriteLine("2. Login to a current account.");

                    Console.WriteLine();
                    Console.Write(" > ");
                    string inp = Console.ReadLine();
                    if (inp == "1")
                    {
                        createAcc("");
                    }
                    else if (inp == "2")
                    {
                        login("");
                    }
                    else if (inp == "/admin")
                    {
                        admin("");
                    }
                }
                else
                {
                    Console.WriteLine("1. Youtube.");
                    Console.WriteLine("2. Facebook.");
                    Console.WriteLine("2. Smoc.");

                    Console.WriteLine();
                    Console.Write(" > ");
                    string inp = Console.ReadLine();
                    if (inp == "1")
                    {
                        System.Diagnostics.Process.Start("http://youtube.com/");
                        Console.ReadKey();
                    }
                    else if (inp == "2")
                    {
                        System.Diagnostics.Process.Start("http://facebook.com/");
                        Console.ReadKey();
                    }
                    else if (inp == "3")
                    {
                        System.Diagnostics.Process.Start("http://smoc.pw/");
                        Console.ReadKey();
                    } else if (inp == "/quit")
                    {
                        log = false;
                        Thread.Sleep(300);
                    }
                }
            }
        }
        static void admin(string text)
        {
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.Write("Root password > ");
            string ps = Console.ReadLine();
            if (ps == "admin")
            {
                Console.ForegroundColor = ConsoleColor.Cyan;
                while (true) {
                    Console.WriteLine("1. Show all users & hashes.");
                    Console.WriteLine("2. Show all passes & hashes.");

                    Console.WriteLine();
                    Console.Write(" > ");
                    string vro = Console.ReadLine();
                    if (vro == "1")
                    {
                        Console.Write(usrsFile);
                        Console.WriteLine();
                    }
                    else if (vro == "2")
                    {
                        Console.Write(lstFile);
                        Console.WriteLine();
                    }
                    else if (vro == "/quit")
                    {
                        Thread.Sleep(300);
                        Console.Clear();
                        break;
                    }
                }
                Console.ForegroundColor = ConsoleColor.White;
            } else
            {
                Console.WriteLine("Incorrect password.");
                Console.ForegroundColor = ConsoleColor.White;
            }
        }
        static void existCheck(string args)
        {
            Console.ForegroundColor = ConsoleColor.Cyan;
            Console.Clear();
            Console.WriteLine("Checking for directories...");
            Thread.Sleep(500);
            if (File.Exists(usrAddr))
            {
                if (File.Exists(lstAddr))
                {
                    Console.Clear();
                    Console.WriteLine("USRS Directory exists.");
                    Thread.Sleep(300);
                    Console.WriteLine("LST Directory exists.");
                    Thread.Sleep(300);
                }
            }
            else
            {
                Console.Clear();
                Console.WriteLine("Directories do not exist, creating them now...");
                Thread.Sleep(300);
                Directory.CreateDirectory("C:\\Users\\atlan\\Documents\\aids\\");
                File.Create("C:\\Users\\atlan\\Documents\\acc\\usrs.txt");
                File.Create("C:\\Users\\atlan\\Documents\\accs\\lst.txt");
                Thread.Sleep(300);
            }
            Console.Clear();
            Console.ForegroundColor = ConsoleColor.White;
        }
        static string md5Gen(string text)
        {
            MD5 hash = new MD5CryptoServiceProvider();
            hash.ComputeHash(ASCIIEncoding.ASCII.GetBytes(text));
            byte[] result = hash.Hash;
            StringBuilder strBldr = new StringBuilder();
            for (int i = 0; i < result.Length; i++)
            {
                strBldr.Append(result[i].ToString("x2"));
            }
            return strBldr.ToString();
        }
        static void login(string args)
        {
            Console.Write("Username: ");
            uname = Console.ReadLine();
            Console.Write("Password: ");
            pword = Console.ReadLine();
            while (true)
            {
                if (usrsFile.Contains(uname))
                {
                    if (lstFile.Contains(pword))
                    {
                        cPassHash = md5Gen(pword);
                        checkHash(cPassHash);
                        break;
                    } else
                    {
                        Console.WriteLine("Error...");
                        break;
                    }
                }
                else
                {
                    Console.WriteLine("Error, incorrect username or password.");
                    Console.Write("Username: ");
                    uname = Console.ReadLine();
                    Console.Write("Password: ");
                    pword = Console.ReadLine();
                }
            }
        }
        static void createAcc(string args)
        {
            Console.Write("Username: ");
            string unameReg = Console.ReadLine();
            Console.Write("Password: ");
            string pwordReg = Console.ReadLine();
            Console.Write("Re-Enter Password: ");
            string pwordRegCheck = Console.ReadLine();
            while (true)
            {
                if (pwordReg == pwordRegCheck)
                {
                    break;
                } else
                {
                    Console.WriteLine();
                    Console.WriteLine("Incorrect, please enter passwords that are the same.");
                    Thread.Sleep(1000);
                    Console.Clear();
                    Console.Write("Password: ");
                    pwordReg = Console.ReadLine();
                    Console.Write("Re-Enter Password: ");
                    pwordRegCheck = Console.ReadLine();
                }
            }
            while (true) {
                if (System.IO.File.ReadAllText("C:\\Users\\atlan\\Documents\\accs\\usrs.txt").Contains(unameReg))
                {
                    Console.Write("That username is taken, please choose another username: ");
                    unameReg = Console.ReadLine();
                }
                else
                {
                    break;
                }
            }
            string pwordHash = md5Gen(pwordReg);
            string newWrd = "\n" + pwordHash + " " + pwordReg;
            string newAcc = "\n" + pwordHash + ":" + unameReg;
            System.IO.File.AppendAllText("C:\\Users\\atlan\\Documents\\accs\\usrs.txt", newAcc);
            if (System.IO.File.ReadAllText("C:\\Users\\atlan\\Documents\\accs\\lst.txt").Contains(newWrd))
            {
            }
            else
            {
                System.IO.File.AppendAllText("C:\\Users\\atlan\\Documents\\accs\\lst.txt", newWrd);
            }
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("Account successfully created.");
            Console.ForegroundColor = ConsoleColor.White;
            Thread.Sleep(1000);
            Console.Clear();
        }
        static void checkHash(string args)
        {
            //Word file
            int counter = 0;
            TextReader tr = new StreamReader(lstAddr);
            int lineAmount = File.ReadLines(lstAddr).Count();
            string[] ListLines = new string[lineAmount];
            for (int i = 0; i < lineAmount; i++)
            {
                ListLines[i] = tr.ReadLine();
                if (ListLines[i].Contains(cPassHash))
                {
                    nHash = ListLines[i];
                    cHash = nHash.Split(' ');
                    nHash = cHash[0];
                }
                counter++;
            }
            //User file
            counter = 0;
            tr = new StreamReader(usrAddr);
            lineAmount = File.ReadLines(usrAddr).Count();
            ListLines = new string[lineAmount];
            for (int i = 0; i < lineAmount; i++)
            {
                ListLines[i] = tr.ReadLine();
                if (ListLines[i].Contains(nHash))
                {
                    nUsr = ListLines[i];
                    fUsr = nUsr.Split(':');
                    nUsr = fUsr[1];
                    if(nUsr == uname)
                    {
                        log = true;
                        Console.ForegroundColor = ConsoleColor.Green;
                        Console.WriteLine("Successfully logged in.");
                        Thread.Sleep(100);
                        Console.Title = "MD5 Accounts program - By smoc | Logged in as " + uname;
                        Console.ForegroundColor = ConsoleColor.White;
                    } else
                    {
                        Console.ForegroundColor = ConsoleColor.Red;
                        Thread.Sleep(100);
                        Console.WriteLine("Password and/or username incorrect!");
                        Console.ForegroundColor = ConsoleColor.White;
                        break;
                    }
                }
                counter++;
            }
        }
    }
}