public ActionResult BtnBanUser()
 {
     try
     {
         int idgrupo = int.Parse(Request.QueryString[0]);
         int iduser  = int.Parse(Request.QueryString[1]);
         using (GrupoModel model = new GrupoModel())
         {
             model.BanUser(idgrupo, iduser);
         }
         return(RedirectToAction("Members", "Grupo", new { GrupoID = idgrupo }));
     }
     catch (Exception ex)
     {
         Console.WriteLine("{0} Exception caught", ex);
         return(RedirectToAction("Erro404", "Error"));
     }
 }