private void btnTimKiem_Click(object sender, EventArgs e) { try { if (txtMaNCC.Text != "") { nhaCungCapDTO.MaNCC = Convert.ToInt32(txtMaNCC.Text); dgvNCC.DataSource = nccBLL.SearchNCC1(nhaCungCapDTO); } else if (txtTenNCC.Text != "") { nhaCungCapDTO.HoTen = txtTenNCC.Text; dgvNCC.DataSource = nccBLL.SearchNCC2(nhaCungCapDTO); } } catch (SqlException ex) { MessageBox.Show("Lỗi " + ex.Message.ToString(), "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning); } }