private void Ok_Click(object sender, RoutedEventArgs e) { try { if (TxtName.Text == "" || txtDate.Text == "") { TxtError.Text = "Beide velden moeten ingevuld zijn!"; } else { travelRepo.CreateTravel(TxtName.Text, txtDate.Text, activeUser.Id); travels.Add(new Travel() { Id = activeUser.Id + TxtName.Text, Name = TxtName.Text, Date = txtDate.Text, UserId = activeUser.Id }); ClosePopup(); } } catch (MobileServiceInvalidOperationException ex) { } }