private void cbo_C1_SelectedValueChanged(object sender, EventArgs e) { DataTable dt = sub.GetHLKMAXZSByC(cbo_C1.EditValue.ToString()); if (dt.Rows.Count > 0) { txt_ZDZS.Text = dt.Rows[0]["N_COOLPIT_TIER_NUM"].ToString(); txt_KCZS.Text = sub.GetHLKZSByC(cbo_C1.Text).ToString(); } }