public function render()
    {
        parent::render();

        // assign all member variables to template
        $aClassVars = get_object_vars($this);
        foreach ($aClassVars as $name => $value) {
            $this->_aViewData[$name] = $value;
        }

        $this->_aViewData['sOutputFile'] = $this->_sFilePath;
        $this->_aViewData['sDownloadFile'] = \OxidEsales\Eshop\Core\Registry::getConfig()->getConfigParam('sShopURL') . $this->sExportPath . $this->sExportFileName . "." . $this->sExportFileType;

        return $this->_sThisTemplate;
    }