//Private
        private Comment AddComment(CommentInputParrams newValues)
        {
            using (ISession session = NHibernateSession.OpenSession())
            {
                try
                {
                    HttpContextWrapper context = (HttpContextWrapper)Request.Properties["MS_HttpContext"];
                    Comment parentComment = session.QueryOver<Comment>().Where(p => p.CommentId == newValues.CommentId).List()[0];
                    IEnumerable<Comment> forLftOnlyUpdate = session.QueryOver<Comment>()
                        .Where(p => p.lft >= parentComment.rgt)
                        .And(p => p.rgt < parentComment.rgt)
                        .List();

                    IEnumerable<Comment> forRgtOnlyUpdate = session.QueryOver<Comment>()
                       .Where(p => p.rgt >= parentComment.rgt)
                       .And(p => p.lft < parentComment.rgt)
                       .List();

                    IEnumerable<Comment> forBothUpdate = session.QueryOver<Comment>()
                       .Where(p => p.rgt >= parentComment.rgt)
                       .And(p => p.lft >= parentComment.rgt)
                       .List();

                    Comment newComment = new Comment();
                    newComment.Text = newValues.Text;

                    newComment.ParentCommentId = newValues.CommentId;
                    newComment.ReplayToUser = parentComment.Creator;
                    newComment.lft = parentComment.rgt;
                    newComment.rgt = parentComment.rgt + 1;
                    newComment.indent = parentComment.indent + 1;
                    newComment.ParentCommenterName = parentComment.CommenterName;
                    newComment.CreationDate = DateTime.Now;
                    if (context.User.Identity.IsAuthenticated)
                    {
                        newComment.Creator = session.QueryOver<UserProfile>().Where(u => u.UserName == context.User.Identity.Name).List()[0];
                        newComment.CommenterName = context.User.Identity.Name;
                    }
                    else
                    {
                        newComment.Creator = null;
                        newComment.CommenterName = newValues.Name;
                    }

                    using (var tx = session.BeginTransaction())
                    {
                        // Enable batch updates in nHibernate congfig (performance hint)
                        // ADO.Net is faster on this matter because we can use update statment on multiple rows
                        // Maybe this can be accomplished through nHibernate but I have no time to read best practises in such short notice
                        foreach (Comment cc in forLftOnlyUpdate)
                        {
                            cc.lft += 2;
                            session.SaveOrUpdate(cc);
                        }

                        foreach (Comment cc in forRgtOnlyUpdate)
                        {
                            cc.rgt += 2;
                            session.SaveOrUpdate(cc);
                        }

                        foreach (Comment cc in forBothUpdate)
                        {
                            cc.lft += 2;
                            cc.rgt += 2;
                            session.SaveOrUpdate(cc);
                        }

                        session.SaveOrUpdate(newComment);
                        tx.Commit();
                    }

                    return newComment;
                }
                catch (Exception e)
                {
                    // show error code
                    return null;
                }
            }
        }