Linq-批量删除方法

//批量删除
public void DeleteNews(List<string> IDList)
{            
      using (ETCDataContext etcDataContext = this.EtcDataContext)
      {
           var news = etcDataContext.SYS_News.Where(o => IDList.Contains(o.ID.ToString()));
           etcDataContext.SYS_News.DeleteAllOnSubmit(news);
           etcDataContext.SubmitChanges();
       }
}