public PartialViewResult AddComment(int PostId, string UserName, string Email, string CommentText)
        {
            int?userId = null;

            if (string.IsNullOrEmpty(User.Identity.Name))
            {
                UserDAO.GetUserId(User.Identity.Name);
            }
            CommentDAO.AddComments(PostId, userId, UserName, Email, CommentText);
            IEnumerable <ViewCommentsModel> viewComments = new List <ViewCommentsModel>();

            viewComments = ViewCommentsModel.GetListComments(CommentDAO.GetComments(PostId));
            return(PartialView("_Comments", viewComments));
        }