private void btnTim_Click(object sender, EventArgs e) { frmTimKiemNCC frmTK = new frmTimKiemNCC(); frmTK.ShowDialog(); str = frmTK.maNCC; DataTable tblNhaCC = new DataTable(); tblNhaCC = BLL.show1NCC(str); dgvNhaCC.DataSource = tblNhaCC; }