private void OnDeleteRegistered(DataGrid Dtg) { var thisUser = DialogLogginViewModel.Users[0]; foreach (GetInfoRegistered_Result DisciplineChecked in Dtg.Items) { if (DisciplineChecked.check == true) { ST.DeleteRegisterStudyUnit(thisUser.ID, DisciplineChecked.DisciplineID); } } ListRegistered = new ObservableCollection <GetInfoRegistered_Result>(ST.GetInfoRegistered(thisUser.ID).ToList()); }