public static function isChildTrading($tradingId, $ChildtradingId)
 {
     $ischild = false;
     $obj_retResult = DAL_manageTrading::getTradingListBytradingId($ChildtradingId);
     //get child node
     if ($obj_retResult->type == 1) {
         $arr_TradingList = $obj_retResult->data;
         $obj_Trading = $arr_TradingList[0];
         $arrParentIds = explode(",", $obj_Trading->Url);
         foreach ($arrParentIds as $TradingParentId) {
             if ($TradingParentId == $tradingId) {
                 $ischild = true;
             }
         }
     }
     return $ischild;
 }