private void btnLocSV_Click(object sender, EventArgs e) { GetpLopInfo(); pDM_LopInfo.DM_LopID = cmbLop.EditValue == null ? 0 : int.Parse(cmbLop.EditValue.ToString()); dtSinhVien = oBSV_SinhVien.GetDaTotNghiep(pDM_LopInfo); grdDiem.DataSource = dtSinhVien; }