Entity framework with linq in asp.net mvc 5

I am using linq query to group by element through one table field, guid.

The problem is that I do not know how to retrieve the object on the view.

Here is my code:

public ActionResult Index2()
{
    List<Imageupload> lists = db.Imageuploads.ToList();
    var a = lists.GroupBy(g => g.guid);

    return View(a);
}

Imageupload is a modal class and Imageuploads is a table in the database.

How can I accomplish that?