Resource Page Description
Language-Integrated Query (LINQ) provides a unified querying model for accessing data regardless of where that data is stored. This groundbreaking innovation bridges the gap between the world of objects and the world of data. This source code demonstrates the basics required to write an IQueryable LINQ provider that works against relational databases. The current implementation is based on LINQ to SQL and only works with Microsoft SQL Server but can easily be modified to support other relational databases such as Oracle.
This sample LINQ provider also supports update, delete and insert operations and implements an Object Tracking mechanism similar to the one offered by LINQ to SQL. There is also an MSDN article accompanying this article that describes its internal workings.
http://msdn.microsoft.com/en-us/vcsharp/ee672195.aspx