public DataTable SelectLsgInfo()
        {
            DataTable myTable = (DataTable)HttpRuntime.Cache[LSG_INFO_WHB];
            if (myTable == null)
            {
                sql = "select lingshigong.id,lsgname,phone,duiname,bianhao from lingshigong, duiinfo where lingshigong.dui_id = duiinfo.id";
                myTable = DbLink.ExecuteDataTable(linkstr1, sql, CommandType.Text);
                AggregateCacheDependency cd = DependencyFacade.GetLsgCache();
                HttpRuntime.Cache.Add(LSG_INFO_WHB, myTable, cd, Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(30), CacheItemPriority.Low, null);
            }

            return myTable;
        }