Why the render result is different With the subsurface modifier i made the model. In the 3D view it look good



In the preview render also looks good Shift+Z



But when i click F12 start render i get this unsubsurface result



May i know the reason why the result is different. I copy the only the model  in a new file and render same result. Any suggestion or help. Thanks
Click on the camera icon of your Subdivision Surface modifier