private void btnXoa_Click(object sender, EventArgs e) { this.Cursor = Cursors.WaitCursor; if (MessageBox.Show("Bạn có muốn xóa không?", "Thông báo", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) { int flat_dk = dk.delete(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), txtMaHV.Text, cbxLopHoc.Text); int flat_tthp = tthp.delete(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), txtMaHV.Text); int flat_thi = thi.deleteMaHV(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), txtMaHV.Text); int flat_hv = hv.delete(AccountHelper.getAccountId(), AccountHelper.getAccoutPassword(), txtMaHV.Text); if (flat_hv == 1 && flat_dk == 1) { DialogHelper.ExtendedShowErrorDialog("Xóa thành công", "", 1, 2); } else { DialogHelper.ExtendedShowErrorDialog("Xóa không thành công", "", 1, 1); } } Load_HV(); XoaText(); EditButton(true, false, false, false); this.Cursor = Cursors.Arrow; }