public static string SetChange(string cid) { Leadin.BLL.StoreCity bllcity1 = new Leadin.BLL.StoreCity(); DataSet ds = bllcity1.GetList(0, "StateInfo=1 and ParentId=" + cid, "SortNum desc,Id desc"); StringBuilder strHtml = new StringBuilder(); foreach (DataRow item in ds.Tables[0].Rows) { strHtml.Append("<option value=\"" + item["Id"].ToString() + "\">" + item["Title"].ToString() + "</option>"); } return(strHtml.ToString()); }