ESENT Serialization class library is built above Managed ESENT. It allows you to store your objects in the underlying extensible storage engine database. Wikipedia has nice article outlining what’s so special about the extensible storage engine.

The binaries are published in NuGet, the compiled documentation is here on the "Releases" page.

If the text in the CHM is too small for you, here's a simple fix.

• Serializes and deserializes objects. To mark the object to be your database record type, apply [EseTable] attribute to your record class, and column attributes to the class members.
• Available on Windows desktops and servers (.NET 4.5+), Windows Store 8.1+ (PC only; technically, it works on Windows Phone 8.1, but the API is unofficial and won't pass WACK API test), Windows Mobile 10.0+. Suitable for building both desktop apps, mobile apps (on supported platforms), and servers.
• Many different column types, ranging from trivial ones like byte or int32, to enums, multi-values, binary streams, arbitrary objects serialized into binary XML.
• Sophisticated indexing: conditional indices if you need to query from a subset of records, tuple indices to implement full-text search.
• Multiple threads can modify the database at the same time, because record-level locking. At the same time, another thread can read the same records without locks, because multi-versioning.
• The recordsets support filtering and sorting by the ESE indexes, and since version 3.0 they expose LINQ-like API to sort and filter.
• The database return records as IEnumerable (where tRow is your record class that has the [EseTable] attribute applied) suitable for lazy evaluation, making it possible to sequentially process a huge dataset that does not even fit in your RAM.
• The library provides DB schema upgrade mechanism, to upgrade DB schema while retaining user's data.
• On desktops and servers, the library supports hot backups.
• Just like Managed ESENT, the library is architecture-neutral ("Any CPU"), and very small because the DB engine is a part of Windows.
• Several demo projects are provided, including client-server demo, and some performance benchmark versus SQLite.
• Good documentation.

• Not all functionality was ported from version 2.x, e.g. there's no raw read/write API, and there's no table change notifications.
• Those LINQ-like queries are limited to a single index. If you'll try to query multiple indices, expression compiler will throw an exception "no single index covers all referenced columns". You can only do that manually, using Recordset.IntersectIndices API.
• Not all parts of the library are tested equally well.