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Use the FormViewDeletedEventArgs.AffectedRows property to determine the number of records affected by the delete operation. This property is commonly used to verify that the correct number of records was deleted in the following situations:
Verify that only a single record was deleted. Sometimes an improperly written delete statement can delete multiple records.
Verify that a record was deleted when an error occurs during the delete operation that does not raise an exception.
Verify that a record was deleted when a data source control that supports conflict detection (optimistic concurrency), such as the System.Web.UI.WebControls.SqlDataSource and System.Web.UI.WebControls.ObjectDataSource controls, has its SqlDataSource.ConflictDetection property set to the ConflictOptions.CompareAllValues enumeration value. Under this setting, a record that has been modified by another user concurrently might not be deleted.