public User CreateUser(string name, string login, string pass)
        {
            ISingleton instSingle = SingletonTXT.getInstance();

            if (name != "" && login != "" && pass != "")
            {
                if (instSingle.FindLogin(login) != null)
                {
                    throw new Exception("Login já existente");
                }
                else
                {
                    User newUser = new User(name, login, pass);
                    instSingle.CreateUser(newUser);
                    return(newUser);
                }
            }
            throw new Exception("Entrada Inválida");
        }