http://blogs.msdn.com/mattwar/pages/linq-links.aspxHere's a list of all the posts in the building an IQueryable provider series. If you want to get the latest and greatest source code just follow that last link. If you want to discover how to build your own IQueryable provider read from the beginning.en-USCommunityServer 2.1 SP1 (Build: 61025.2)