private: void ButtonUpClick(Object^ sender, EventArgs^ e) {
    DataGridView^ grid = this->dataGridView;
    try {
        int totalRows = grid->Rows->Count;
        int idx = grid->SelectedCells[0]->OwningRow->Index;
        if (idx == 0) return;
        int col = grid->SelectedCells[0]->OwningColumn->Index;
        DataGridViewRowCollection^ rows = grid->Rows;
        DataGridViewRow^ row = rows[idx];
        rows->Remove(row);
        rows->Insert(idx - 1, row);
        grid->ClearSelection();
        grid->Rows[idx - 1]->Cells[col]->Selected = true;
    } catch (Exception^ e){
    }
}

private: void ButtonDownClick(Object^ sender, EventArgs^ e) {
    DataGridView^ grid = this->dataGridView;
    try {
        int totalRows = grid->Rows->Count;
        int idx = grid->SelectedCells[0]->OwningRow->Index;
        if (idx == totalRows - 2) return;
        int col = grid->SelectedCells[0]->OwningColumn->Index;
        DataGridViewRowCollection^ rows = grid->Rows;
        DataGridViewRow^ row = rows[idx];
        rows->Remove(row);
        rows->Insert(idx + 1, row);
        grid->ClearSelection();
        grid->Rows[idx + 1]->Cells[col]->Selected = true;
    } catch (Exception^ e){
    }
}