create excel in controller and download to user

I'm stuck in this problem. I need to buid a excel file from some info retreived from my database into my controller and just by calling the ActionResponse, this download the file, i been using gembox spreadsheet but run out of downloads pretty quickly, this is the logic of my controller:

 public ActionResult Report()
    {
        IList MyClientList = new List();
        DataBaseDataContext table = new DataBaseDataContext();
        var query = from u in table.Subscriptions
                    where u.partnerid_mpn == Convert.ToInt32(id)
                    select u;

        var list = query.ToList();
        if (query.Count() > 0)
        {
            foreach (var item in list)
            {
                ClientNode node = new ClientNode();
                node.Id = item.id_client;
                node.Name = item.Name;
                MyClientList.Add(node);
            }

        }
        //create  the file here based in the list and return it to user

        return View();
    }

Thanks to any answer. :)