private void btnSuaSinhVien_Click(object sender, EventArgs e) { string diachi = txtDiaChi.Text.Trim(); string tensv = txtTenSV.Text.Trim(); string mssv = txtMSSV.Text.Trim(); string malop; string gioitinh; if (radNam.Checked) { gioitinh = "Nam"; } else { gioitinh = "Nu"; } if (cboMaLop2.SelectedIndex == -1) { MessageBox.Show("Vui long chon ma lop them sinh vien"); } else { malop = cboMaLop2.SelectedItem.ToString().Trim(); if (KiemTraThongTinSinhVienCoThieuKhong(mssv, tensv, diachi) == false) { st.CapNhatThongTinSinhVien(new Student(malop, mssv, tensv, gioitinh, diachi)); MessageBox.Show("Cap nhat thanh cong"); lvSinhVien.Items.Clear(); HienThiDanhSachSinhVien(); cboMaLop2.Text = ""; txtDiaChi.Text = ""; txtMSSV.Text = ""; txtTenSV.Text = ""; } else { MessageBox.Show("Cap nhat that bai"); lvSinhVien.Items.Clear(); HienThiDanhSachSinhVien(); cboMaLop2.Text = ""; txtDiaChi.Text = ""; txtMSSV.Text = ""; txtTenSV.Text = ""; } } }