public JsonResult ViewChatMessage(Int64 id)
        {
            taskAssignId = id;

            var chatMessages = chatMessageManager.GetAll().Where(x => x.TaskAssignId == id).ToList();

            var messages = (from c in chatMessages where c.TaskAssignId == id
                            select new ChatMessageVm
            {
                Id = c.Id,
                TaskAssignId = c.TaskAssignId,
                ChatMessageText = c.ChatMessageText,
                Created = c.Created
            }).OrderByDescending(x => x.Id).ToList();

            return(Json(new { Data = messages, status = messages == null ? false : true }, JsonRequestBehavior.AllowGet));
        }