Zmienna jest pusta i nie rozumiem dlaczego

Witam. Mam problem z funkcją SendProfit( w klasie Profit podanej niżej). W momencie tworzenia plików danego miesiąca zmienna LoggedUser z klasy Account jest pusta. Nie bardzo rozumiem dlaczego?

MainWindow

        public MainWindow()
        {
            InitializeComponent();
            
        }

        private void createAccountButton_Click(object sender, RoutedEventArgs e)
        {
            Account account = new Account(createUserNameTB.Text, createUserPasswordTB.Password);
            account.CreateFiles();
            account.CreateUser();
        }

        private void loginButton_Click(object sender, RoutedEventArgs e)
        {
            Account account = new Account(loginTB.Text, loginPasswordBox.Password);
            account.Authorization();
        }

        private void sendProfitButton_Click(object sender, RoutedEventArgs e)
        {
            Profit profit = new Profit(profitTB.Text, profitDescriptionTB.Text, monthProfitCB.SelectedIndex);
            profit.checkingTextBoxValue();
            profit.SendProfit();
        }

Klasa Account

 public class Account
    {
        private string userName;
        private string userPassword;
        public string LoggedUser;
        public string[] months = { "January", "Febrauary", "March", "April", "May", "June",
                              "July", "August", "Sectember", "October", "November", "December" };
        public Account()
        {
               
        }
        
        public Account(string username, string userpassword)
        {
            userName = username;
            userPassword = userpassword;
        }

        public void CreateUser()
        {
            StreamWriter UserFileWritter = new StreamWriter(@"E:\" + userName + @"\" + userName + @".txt", true);
            UserFileWritter.WriteLine(userName);
            UserFileWritter.WriteLine(userPassword);
            UserFileWritter.Close();
            MessageBox.Show("Konto utworzone!");
        }

         public void CreateFiles()
         {
             for(int i=0; i<months.Length; i++)
             {
                 Directory.CreateDirectory(@"E:\" + userName + @"\Profit\");
                 Directory.CreateDirectory(@"E:\" + userName + @"\Expense\");
                 StreamWriter ProfitFilesWriter = new StreamWriter(@"E:\" + userName + @"\Profit\" + months[i] +  @".txt");
                 StreamWriter ExpenseFilesWriter = new StreamWriter(@"E:\" + userName + @"\Expense\" + months[i] + @".txt");
                 ProfitFilesWriter.Close();
                 ExpenseFilesWriter.Close();
             }
         }
        
        public void Authorization()
         {
            if(File.Exists(@"E:\" + userName + @"\" + userName + @".txt"))
            {
             StreamReader AuthorizationUserReader = new StreamReader(@"E:\" + userName + @"\" + userName + @".txt");
             string authorizationUserName = AuthorizationUserReader.ReadLine();
             string authorizationUserPassword = AuthorizationUserReader.ReadLine();
             AuthorizationUserReader.Close();

               if(authorizationUserName == userName && authorizationUserPassword == userPassword)
               {
                  OpenFiles();
                  MessageBox.Show("Zalogowano!");
                  LoggedUser = authorizationUserName;
                }
                else
                {
                  MessageBox.Show("Złe hasło!");
                }
            }
            else
            {
                MessageBox.Show("Użytkownik nie istnieje!");
            }
         }

         public void OpenFiles()
         {
             for (int i = 0; i < months.Length; i++)
             {
                 StreamReader ProfitFileReader = new StreamReader(@"E:\" + userName + @"\Profit\" + months[i] + @".txt", true);
                 StreamReader ExpenseFileReader = new StreamReader(@"E:\" + userName + @"\Expense\" + months[i] + @".txt", true);
             }
         }
        

    } // end of class Account

Klasa Profit

    class Profit
    {
        Account account = new Account();

        private string profitTextBoxValue;
        private string description;
        private decimal profit;
        private int monthSelected;

        public Profit(string p, string d, int m)
        {
            profitTextBoxValue = p;
            description = d;
            monthSelected = m;
        }


        public void checkingTextBoxValue()
        {       // popraw pierwszy warunek[ czy jest stringiem]
            if (profitTextBoxValue == "" || profitTextBoxValue == null)
            {
                MessageBox.Show("To nie jest liczba!");
            }
            else
            {
                profit = Convert.ToDecimal(profitTextBoxValue);
            }
        }

        public void SendProfit()
        {
            StreamWriter sendProfitFile = new StreamWriter(@"E:\" + account.LoggedUser + @"\Profit\" + account.months[monthSelected] + @".txt", true);
            sendProfitFile.WriteLine(profit);
            sendProfitFile.WriteLine(description);
            sendProfitFile.Close();
            MessageBox.Show(account.LoggedUser);
        }


    } // end of Profit class

Nie sprawdzałem co prawda w Visual'u, ale nie widzę byś gdzieś edytował ten obiekt:

Account account = new Account();

W ten sposób wszystkie pola w Account mają wartość domyślną.