eXpress Persistent Objects for .NET (DevExpress XPO) represents a bridge between the object world and the world of relational databases. eXpress Persistent Objects for .NET (DevExpress XPO) gives developers the freedom to build true business objects without having to deal with the tedious complexities of mapping them onto database tables. eXpress Persistent Objects for .NET (DevExpress XPO) completely abstracts the database layer from a developer, leaving him or her fully in the object-oriented realm. With DevExpress XPO, you can build applications that work with multiple database systems (presently supports MS Access, MS SQL Server, MySQL, Oracle, PostgreSql, Firebird, PervasiveSQL, VistaDB, SQL Anywhere, Advantage, DB2 and Sybase) without making any changes to your code.