/// <summary> /// Check Login /// </summary> /// <param name="email"></param> /// <param name="pass"></param> /// <returns>NULL : false</returns> /// <returns># NULL : true</returns> public string CheckLogin(string email, string pass) { string hoten = null; int flag = CheckMail(email); if (flag == 0) { return(null); } if (flag == 1) { SinhVienDAO context = new SinhVienDAO(); SinhVien sv = context.GetLoginSinhVien(email, pass); if (sv == null) { return(null); } hoten = "SINHVIEN:" + sv.MaSV; return(hoten); } if (flag == 2) { GiangVien gv = GiangVienDAO.GetLoginGiangVien(email, pass); if (gv == null) { return(null); } hoten = "GIANGVIEN:" + gv.MaGV; return(hoten); } return(null); }