public bool IsValid(UserAccount user)
        {
            DBA database = new DBA();

            foreach (UserAccount USER in database.GetUsers())
            {
                string hash = FormsAuthentication.HashPasswordForStoringInConfigFile(user.Password, "sha1");
                if (USER.Username == user.Username && USER.Password == hash)
                {
                    return(true);
                }
            }
            return(false);
        }