http://www.devart.com/dotconnect/postgresql/
dotConnect for PostgreSQL, formerly known as PostgreSQLDirect .NET, is an enhanced ORM enabled data provider for PostgreSQL that builds on ADO.NET technology to present a complete solution for developing PostgreSQL-based database applications. It introduces new approaches for designing application architecture, boosts productivity, and leverages database applications.
Devart (http://www.devart.com/)