Login

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System;
using System.Text.RegularExpressions;

public class Login : MonoBehaviour {
    public GameObject username;
    public GameObject password;
    public GameObject dialogue;
    public String SceneAfterLogin;
    private string Username;
    private string Password;
    private String[] Lines;
    private string DecryptedPass;

    public void LoginButton(){
        bool UN = false;
        bool PW = false;
        if (Username != ""){
            if(System.IO.File.Exists(@"C:/UnityTestFolder/"+Username+".txt")){
                UN = true;
                Lines = System.IO.File.ReadAllLines(@"C:/UnityTestFolder/"+Username+".txt");
            } else {
                Debug.LogWarning("Username Invaild");
                dialogue.SetActive(true);
            }
        } else {
            Debug.LogWarning("Username Field Empty");
            dialogue.SetActive(true);
        }
        if (Password != ""){
            if (System.IO.File.Exists(@"C:/UnityTestFolder/"+Username+".txt")){
                int i = 1;
                foreach(char c in Lines[2]){
                    i++;
                    char Decrypted = (char)(c / i);
                    DecryptedPass += Decrypted.ToString();
                }
                if (Password == DecryptedPass){
                    PW = true;
                } else {
                    Debug.LogWarning("Password Is invalid");
                    dialogue.SetActive(true);
                }
            } else {
                Debug.LogWarning("Password Is invalid");
                dialogue.SetActive(true);
            }
        } else {
            Debug.LogWarning("Password Field Empty");
            dialogue.SetActive(true);
        }
        if (UN == true&&PW == true){
            username.GetComponent<InputField>().text = "";
            password.GetComponent<InputField>().text = "";
            print ("Login Sucessful");
            Application.LoadLevel(SceneAfterLogin);
        }
    }
    // Update is called once per frame
    void Update () {
        if (Input.GetKeyDown(KeyCode.Tab)){
            if (username.GetComponent<InputField>().isFocused){
                password.GetComponent<InputField>().Select();
            }
        }
        if (Input.GetKeyDown(KeyCode.Return)){
            if (Password != ""&&Password != ""){
                LoginButton();
            }
        }
        Username = username.GetComponent<InputField>().text;
        Password = password.GetComponent<InputField>().text;
    }
}