private void GUI_Diem_Load(object sender, EventArgs e) { dataGridView1.DataSource = busDien.GetDiem(); cbbMonHoc.DataSource = busDien.GetMonHoc(); cbbMonHoc.DisplayMember = "tenMonHoc"; cbbMonHoc.ValueMember = "maMonHoc"; cbbSinhVien.DataSource = busDien.GetSinHVien(); cbbSinhVien.DisplayMember = "tenSinhVien"; cbbSinhVien.ValueMember = "maSinhVien"; txtMaSV.Text = cbbSinhVien.SelectedValue.ToString(); txtMaMH.Text = cbbMonHoc.SelectedValue.ToString(); }