private void UpdateBackup(int id, byte[] sheetData) { var newSheet = new Models.BackupSheet { ProductId = id, SafetySheet = sheetData }; if (!_context.GetBackupSheet(id).Any()) { _context.AddSheet(newSheet); } else { CheckContentChange.CompareAndUpdate(_context.GetBackupSheet(id).FirstOrDefault().SafetySheet, newSheet.SafetySheet, id, _context); } }