public ActionResult DeletePatient(int id)
        {
            var patient = patientRepository.GetPatientById(id);

            var exercises = exerciseRepository.GetAllPatientExercises(patient.Id);

            //Usuwanie wszystkich cwiczeń dla pacjenta
            exerciseRepository.DeleteExercises(exercises);
            exerciseRepository.Complete();

            patientRepository.DeletePatient(patient);
            patientRepository.Complete();
            return(RedirectToAction("PatientList"));
        }