public FromThemSinhVien(string maLop) { InitializeComponent(); txtMaLop.Text = maLop; txtMaSV.Text = SinhVien.TaoMaSV(maLop); txtEmail.Text = (txtMaSV.Text.Trim() == "") ? KeyConst.EmailTag.Student : txtMaSV.Text.Trim() + KeyConst.EmailTag.Student; }