This video illustrates the "Database-First" approach to XAF development when DevExpress XPO ORM is used for data access. You will see how to use the XPO Data Model Designer to create an XAF application based on the existing database. If you'd rather read about it, check out the Generate XPO Business Classes for Existing Data Tables in Visual Studio 2010 (or Later Versions) topic in XAF online documentation. http://documentation.devexpress.com/#Xaf/CustomDocument3451