public function setFileName($fileName)
    {
        $this->fileName = $fileName;
        $this->headers->add(array('Content-Disposition' => 'attachment; filename="' . $this->fileName . '"'));
        return $this;
    }
public function setFileName($fileName)
    {
        $this->fileName = $fileName;
        $this->headers->add(array('Content-Disposition' => 'attachment; filename="' . $this->fileName . '"'));
        return $this;
    }
public function setFileName ( $ fileName ) { $ this -> fileName = $ fileName ; $ this -> headers -> add ( array ( 'Content-Disposition' => 'attachment; filename="' . $ this -> fileName . '"' ) ) ; return $ this ; }
Set export file name

@param string $fileName
@return $this
Set export file name