public ActionResult AcceptFollowRequest(string sender, string source)
        {
            if (Session["username"] == null)
            {
                return(RedirectToAction("SessionExpired"));
            }
            CRUD.AcceptFollowRequest(sender, Session["username"].ToString());
            if (source == "FollowRequests")
            {
                List <User> u = CRUD.DisplayFollowRequestsOfAUser(Session["username"].ToString());
                return(View(source, u));
            }

            List <User> users = CRUD.AllUsers();

            return(View(source, users));
        }