OldValues collection in event “ItemUpdating” of DetailsView is always empty
问题 I´m using a DetailsView but when updating, I cannot get the OldValues because the DetailsViewUpdateEventArgs.OldValues of ItemUpdating event is always empty. The NewValues has the values ok. Note: I´m not using a datasource component in my application (SqlDataSource, ObjectDataSource, EntityDataSource, etc.). In this case should I do something manually? Any ideas will be welcome! Thanks! Complementing the information: I´m using ASP.NET 4.0 (WebForms) A snippet of code that I believe to be