public ActionResult ThongBao(string noiDungThongBao, string nguoiNhan, FormCollection form) { if (nguoiNhan != null) { UserModel um = new UserModel(); AccountDAL adal = new AccountDAL(); int IDSender = adal.getIDFromUsername(User.Identity.Name); int IDReciver = adal.getIDFromUsername(nguoiNhan); um.SendMessage(IDSender, IDReciver, noiDungThongBao); return RedirectToAction("Index", "Home"); } else { GlobalDataModel gdm = new GlobalDataModel(); gdm.ThemThongBao(noiDungThongBao); return RedirectToAction("Index", "Home"); } return null; }