When you call a DbDataAdapter.Update, and it throws an exception, the exception does not include the underlying Command and its parameters.
Since the DbDataAdapter can have three commands for applying changes (DeleteCommand, InsertCommand and UpdateCommand), asking those is a bit inconvenient.
The other way is to attach an event handler to the DAL specific RowUpdated event (for instance SqlDataAdapter.RowUpdated).
This is event is called from the virtual OnRowUpdatedMethod, and has a value parameter of type RowUpdatedEventArgs which contains the Command, and Errors that occurred. Errors is just the Exception that can help indicate what went wrong.
–jeroen
via: DbDataAdapter.Update Method System.Data.Common.
The Wiert Corner - irregular stream of stuff 