title: How To Make NHibernate Automatically change an "Updated" column
body: <p>I am applying NHibernate to an existing project, where tables and columns are already defined and fixed.</p>
  
  <p>The database is MS-SQL-2008.
  NHibernate 2.1.2</p>
  
  <p>Many tables have a column of type timestamp named "ReplicationID", and also a column of type datetime named "UpdatedDT".</p>
  
  <p>I understand I might be able to use the <code>&lt;timestamp&gt;</code> element of the mapping file to describe the "ReplicationID" column which will allow NHibernate to manage that column.</p>
  
  <p>Is it possible to make NHibernate automatically update the UpdatedDT column when the row is updated? I suppose I could try mapping the UpdatedDT property to be of type timestamp, but that have other side effects.</p>