private void btnXoaNV_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) { try { BUS_NHANVIEN.Xoa_NhanVien(txtMaNV.Text); DialogResult dr = MessageBox.Show("Xoa thành công"); if (dr == DialogResult.OK) { loadata(); } } catch (Exception ex) { MessageBox.Show("Lỗi" + ex.ToString()); } }