Asp.net detailsview - 更新后获取数据

I have a web page with an editable DetailsView. After it is (successfully) edited, I need to use some of the edited fields to update some other tables in the database (in the code behind). I tried to use the DetailsView.DetailItem in the DetailsView_ItemUpdated event code, but the DetailItem isn't available any more - it is null. What's the best way to get at the updated field information?I have a web page with an editable DetailsView.