Case 降序升序排列

 select nc.Class_Name,hn.home_news_id,hn.hemo_id,hn.hemo_Date,
 hn.hemo_title,hemo_order from Hemo_News  as hn
 inner join NewsClass as nc on hn.home_news_id = nc.home_news_id
  where hn.home_news_id='' order by
   case when hemo_order = 0 then 0  el
 se 1 end desc,hemo_order asc

 // <summary>
   /// 获得数据列表
   /// </summary>
   public DataSet GetList(string strWhere)
   {
               string strSql = "select nc.Class_Name,hn.home_news_id,hn.hemo_id,hn.hemo_Date,hn.hemo_title,hemo_order from Hemo_News  as";
               strSql = strSql + " hn inner join NewsClass as nc on hn.home_news_id = nc.home_news_id";
               if(strWhere.Trim()!="")
               {
                  strSql = strSql + " where " + strWhere +"order by  case when hemo_order = 0 then 0  else 1 end desc,hemo_order asc";
               }
      return DbHelperSQL.Query(strSql.ToString());
   }

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