// POST api/Comment
        public HttpResponseMessage PostPostComment(PostComment postcomment)
        {
            postcomment.CommentedBy = WebSecurity.CurrentUserId;
            postcomment.CommentedDate = DateTime.UtcNow;
            ModelState.Remove("postcomment.CommentedBy");
            ModelState.Remove("postcomment.CommentedDate");
            if (ModelState.IsValid)
            {
                db.PostComments.Add(postcomment);
                db.SaveChanges();
                var usr = db.UserProfiles.FirstOrDefault(x => x.UserId == postcomment.CommentedBy);
                var ret = new
                {
                    CommentedBy = postcomment.CommentedBy,
                    CommentedByName = usr.UserName,
                    CommentedByAvatar =imgFolder +(String.IsNullOrEmpty(usr.AvatarExt) ? defaultAvatar : postcomment.CommentedBy + "." + postcomment.UserProfile.AvatarExt),
                    CommentedDate = postcomment.CommentedDate,
                    CommentId = postcomment.CommentId,
                    Message = postcomment.Message,
                    PostId = postcomment.PostId
                };

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, ret);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = postcomment.CommentId }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }
        // PUT api/Comment/5
        public HttpResponseMessage PutPostComment(int id, PostComment postcomment)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != postcomment.CommentId)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            db.Entry(postcomment).State = EntityState.Modified;
            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }