During System.Data.Common.DbDataAdapter.Update(System.Data.DataSet), if this property is not set and primary key information is present in the System.Data.DataSet, the OleDbDataAdapter.DeleteCommand can be generated automatically if you set the OleDbDataAdapter.SelectCommand property and use the System.Data.OleDb.OleDbCommandBuilder. Then, any additional commands that you do not set are generated by the System.Data.OleDb.OleDbCommandBuilder. This generation logic requires key column information to be present in the System.Data.DataSet. For more information, see Automatically Generated Commands.

When OleDbDataAdapter.DeleteCommand is assigned to a previously created System.Data.OleDb.OleDbCommand, the System.Data.OleDb.OleDbCommand is not cloned. The OleDbDataAdapter.DeleteCommand maintains a reference to the previously created System.Data.OleDb.OleDbCommand object.