/// <summary>
        /// Cập nhật điểm người dùng
        /// </summary>
        /// <param name="user"></param>
        /// <param name="document"></param>
        /// <returns></returns>
        public async Task <bool> UpdatePointAfterDownload(PosterParam posterParam)
        {
            var  reducePoint   = new User();
            var  increasePoint = new User();
            var  document      = new Document();
            bool res;
            var  posterID     = new MySqlParameter("@posterID", posterParam.Poster);
            var  downloaderID = new MySqlParameter("@downloaderID", posterParam.Downloader);

            increasePoint = await _context.Users.FromSqlRaw("Select * from Users where UserID=@posterID", posterID).FirstOrDefaultAsync();

            reducePoint = await _context.Users.FromSqlRaw("Select * from Users where UserID=@downloaderID", downloaderID).FirstOrDefaultAsync();

            document = await _context.Document.SingleOrDefaultAsync(x => x.DocumentID == posterParam.DocumentID);

            if (increasePoint != null && reducePoint != null && document != null)
            {
                increasePoint.Point = increasePoint.Point + (posterParam.Point / 2);
                reducePoint.Point   = reducePoint.Point - posterParam.Point;
                document.DownloadCount++;
                _context.Entry(reducePoint).State   = EntityState.Modified;
                _context.Entry(document).State      = EntityState.Modified;
                _context.Entry(increasePoint).State = EntityState.Modified;

                _context.SaveChanges();
                res = true;
            }
            else
            {
                res = false;
            }
            return(res);
        }
        public async Task <ServiceResponse> UpdatePointAfterDownload(PosterParam posterParam)
        {
            ServiceResponse result = new ServiceResponse();

            try
            {
                result.Data = await _userBL.UpdatePointAfterDownload(posterParam);

                result.Code    = ServiceResponseCode.Success;
                result.Success = true;
            }
            catch (Exception ex)
            {
                result.OnExeption(ex);
            }
            return(result);
        }