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During System.Data.Common.DbDataAdapter.Update(DataSet), if this property is not set and primary key information is present in the System.Data.DataSet, the IDbDataAdapter.DeleteCommand can be generated automatically if you set the SelectCommand property of a .NET Framework data provider. Then, any additional commands that you do not set are generated by the CommandBuilder. This generation logic requires key column information to be present in the System.Data.DataSet. For more information see [<topic://cpconAutomaticallyGeneratedCommands>].
When IDbDataAdapter.DeleteCommand is assigned to a previously created System.Data.IDbCommand, the System.Data.IDbCommand is not cloned. The IDbDataAdapter.DeleteCommand maintains a reference to the previously created System.Data.IDbCommand object.