objectdatasource cast gridview datasource back to generic list
<p>environment: asp.net fx3.5</p>

<p>i'm using the objectdatasource for my gridview. at first, i load up my gridview with records from a generic <code>List&lt;Attachments&gt;</code> for my customer. Next I'd like to add/remove items from the gridview without hitting database until after all the add/removes are done. Then the user will hit Save button and then I will persist the items in the gridview.</p>

<p>my question is how do I add/remove items in the gridview while the objectdatasource is wired up to gridview? my guess is somehow cast the gridview rows back to generic list, and add/remove items, and rebind? is that even possible?</p>
