public ProfileComment Add(string comment, int lineNumber = -1)
        {
            if (comment == null)
            {
                return(null);
            }

            var item = new ProfileComment(comment, lineNumber);

            _items.Add(item);
            return(item);
        }
        public void Add(T item)
        {
            if (item == null)
            {
                throw new ArgumentNullException("item");
            }

            _items.Add(item);
        }