public bool DeleteOwnComment(int id)
        {
            using (var db = new MysqlDataContext())
            {
                var own = db.OwnComment.FirstOrDefault(o => o.CommentId == id);
                if (own == null)
                {
                    return(false);
                }

                db.Remove(own);
                return(db.SaveChanges() > 0);
            }
        }
        public bool DeleteHistory(int id)
        {
            using (var db = new MysqlDataContext())
            {
                var history = db.History.FirstOrDefault(h => h.HistoryId == id);
                if (history == null)
                {
                    return(false);
                }

                db.Remove(history);
                return(db.SaveChanges() > 0);
            }
        }