public ActionResult Index(FormCollection collection)
        {
            BizProcess.Platform.OnlineUsers bou = new BizProcess.Platform.OnlineUsers();
            if (!Request.Form["ClearAll"].IsNullOrEmpty())
            {
                bou.RemoveAll();
            }

            if (!Request.Form["ClearSelect"].IsNullOrEmpty())
            {
                string userids = Request.Form["checkbox_app"];
                if (!userids.IsNullOrEmpty())
                {
                    foreach (string userid in userids.Split(','))
                    {
                        Guid uid;
                        if (userid.IsGuid(out uid))
                        {
                            bou.Remove(uid);
                        }
                    }
                }
            }

            return(query(collection));
        }