DataGridView绑定数据之后如何修改列值

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e == null || e.Value == null || !(sender is DataGridView))
                return;
            DataGridView view = (DataGridView)sender;
            try
            {
                if (view.Columns[e.ColumnIndex].DataPropertyName == "InOrOut")
                {
                    int val = Convert.ToInt32(e.Value);
                    switch (val)
                    {
                        case 0:
                            e.Value = "进场";
                            break;
                        case 1:
                            e.Value = "出场";
                            break;
                        default:
                            break;
                    }
                    e.FormattingApplied = true;
                }
                if (view.Columns[e.ColumnIndex].DataPropertyName == "ParkingLotID")
                {
                    int val = Convert.ToInt32(e.Value);
                    ACS_Parking.Model.tc_parkinglotinfo modelParkingLotInfo=bll_parkinglotinfo.GetModel(val);
                    if (modelParkingLotInfo != null)
                    {
                        e.Value = modelParkingLotInfo.ParkingLotName;
                    }
                    e.FormattingApplied = true;
                }
               
            }
            catch (System.Exception ex)
            {
                e.FormattingApplied = false;
                MessageBox.Show(ex.ToString());
            }
        }