public ActionResult AddTagToSession(int sessionId, string tagName)
        {
            var result = new { Success = false, TagId = -1 };

            if (tagName.Length < 1)
            {
                return(Json(result));
            }

            var tagIdFromDb = _sessionManager.AddTagToSession(sessionId, tagName);

            if (tagIdFromDb != null)
            {
                result = new { Success = true, TagId = (int)tagIdFromDb }
            }
            ;

            return(Json(result));
        }