public virtual User GetUser(string username, string password)
    {
        User systemUser = new User();

        systemUser = (from u in _context.Users where u.Username == username && u.UserPassword == password select u).FirstOrDefault();
        List <IUserRole> roleList = _userRoleRepository.GetRoles(systemUser.UserID);

        systemUser._roles = roleList;

        return(systemUser);
    }