public override void OnAuthorization(HttpActionContext actionContext)
        {
            if (SkipAuthorization(actionContext))
            {
                return;
            }

            var userSessionManager = new UserSessionManager();

            if (userSessionManager.ReValidateSession())
            {
                base.OnAuthorization(actionContext);
            }
            else
            {
                actionContext.Response = actionContext.ControllerContext.Request.CreateErrorResponse(
                    HttpStatusCode.Unauthorized, "Session token expried or not valid.");
            }
        }