private void OnSaveClickCommand() { try { if (!_modelTrain.IsBusy) { if (CheckInputData()) { IsLoading = true; ItemEdit.MaLop = MaLop; ItemEdit.TenLop = TenLop; if (ParentID != -1) { ItemEdit.ParentID = ParentID; } else { ItemEdit.ParentID = null; } if (_selectedKhoa != null) { ItemEdit.KhoaID = _selectedKhoa.KhoaID; } else { ItemEdit.KhoaID = null; } _modelTrain.SaveClassAsync(ItemEdit); } } } catch (Exception ex) { MessageCustomize.Show(ex.Message); } }