Question: How can I use linqpad with code only in ef 4.

I mean how to reference metadata when there is no edmx file?

Answer: 
I believe you want to `unset($arr['addtocart']);`
```
$vars = array('name' => super, 'price' => 65.87, 'quantity' => 25, 'addtocart' => 1);

unset($vars['addtocart']);

```