public bool AddNewBookmark(BOOKMARK newBookmarkModel)
        {
            bool _retVal = false;

            _context.BOOKMARKs.Add(newBookmarkModel);
            _context.SaveChanges();
            _retVal = true;

            return _retVal;
        }
        public bool UpdateBookmark(BOOKMARK updatedBookmarkModel)
        {
            bool _retVal = false;

            BOOKMARK _modelToBeUpdated = _context.BOOKMARKs.Find(updatedBookmarkModel.BOOKMARK_ID);

            if (_modelToBeUpdated != null)
            {
                _context.Entry(_modelToBeUpdated).CurrentValues.SetValues(updatedBookmarkModel);
                _context.SaveChanges();
                _retVal = true;
            }

            return _retVal;
        }