private void btnXoa_Click(object sender, EventArgs e) { this.Cursor = Cursors.WaitCursor; var row = GetCurrentRow(); if (row == null) { DialogHelper.ShowMissingSelectedRow(); return; } string maLop = row.Cells["MALOP"].Value.ToString(); string maGV = GetEqualName(row.Cells["MAGV"].Value.ToString(), dtGiangVien, 1, 0); LopHoc lophoc = new LopHoc(); CT_LopHoc chitiet = new CT_LopHoc(); chitiet.delete(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), maLop, maGV); lophoc.delete(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), maLop); ShowTable(); this.Cursor = Cursors.Arrow; }