Linq i DayOfWeek problem

Code:
var queryX = from a in baza_kon.Tikets
                          join pm in baza_kon.VrsteRadovas on a.Id_vrste_rada equals pm.Id_vrste_rada
                          where a.Aktivan == 1 && a.Id_statusa_tiketa == 2                        
                         
                          && (a.DatumVremeKreiranja.Value.DayOfWeek) != DayOfWeek.Sunday
                         

                          group new { a, pm } by new { a.Id_vrste_rada, pm.NazivVrsteRada, a.DodeljenKorisniku } into g

                          select new 
                          {
                              Count = g.Key.Id_vrste_rada,
                              Vrsta_rada = g.Key.NazivVrsteRada,
                              Radnik = g.Key.DodeljenKorisniku == null ? "Nedodeljen" :   g.Key.DodeljenKorisniku,
                              Broj = g.Count()
                          

                          };

             queryX.ToList();