public void GetFree() { DataTable dtzyx1 = tb_matrl_main.GetZYX1(txtstlgrd.Value).Tables[0]; if (dtzyx1.Rows.Count > 0) { dropzyx1.DataSource = dtzyx1; dropzyx1.DataTextField = "ZYX1"; dropzyx1.DataValueField = "ZYX1"; dropzyx1.DataBind(); } else { dropzyx1.DataSource = null; dropzyx1.DataBind(); } DataTable dtzyx2 = tb_matrl_main.GetZYX2(txtstlgrd.Value).Tables[0]; if (dtzyx2.Rows.Count > 0) { dropzyx2.DataSource = dtzyx2; dropzyx2.DataTextField = "ZYX2"; dropzyx2.DataValueField = "ZYX2"; dropzyx2.DataBind(); } else { dropzyx2.DataSource = null; dropzyx2.DataBind(); } }