public void RunAuthentication()
 {
     if (Login != null && Login == loadLogin)
     {
         MainMenuForm cinema = new MainMenuForm(Login, FullName, Position, lvlAccses);
         cinema.Show();
     }
     else
     {
         MessageBox.Show("Аккаунт не зарегистрирован!", "Внимание!");
     }
 }
        public MainMenuForm(string login, string fullName, string position, int lvlAccses)
        {
            InitializeComponent();

            Login     = login;
            FullName  = fullName;
            Positions = position;
            LvlAccses = lvlAccses;
            mainMenu  = this;

            FillUserDate();
            ProvidingAccses();
            Application.OpenForms[0].Hide();
        }