Summary
With the introduction of Language Integrated Query in .NET 3.5 (and C# 3.0), data access to a wide variety of domains has never been easier. Ranging from in-memory querying over IEnumerable<T> collections, over hierarchical XML data, to all sorts of external database formats, LINQ unifies querying over all those data domains. In doing so, it brings a lot of desirable properties to the table:
Better compile-time checking of queries
Object-oriented mapping of entities being queried
Security advantages (for example, protections against SQL ...
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