public async Task Delete(Models.PaperUpload paperUpload)
        {
            var check = await Read(paperUpload.ID);

            if (check != null)
            {
                _db.PaperUpload.Remove(paperUpload);
                await _db.SaveChangesAsync();
            }
        }
        public async Task <Models.PaperUpload> Update(Models.PaperUpload paperUpload)
        {
            var check = await Read(paperUpload.ID);

            if (check != null)
            {
                _db.PaperUpload.Update(paperUpload);
                await _db.SaveChangesAsync();

                return(paperUpload);
            }

            return(paperUpload);
        }