Structs have names. Records don't.

See http://en.wikipedia.org/wiki/Nominal_type_system and http://en.wikipedia.org/wiki/Structural_type_system.

C# has anonymous types, which are closer to records, but there's no way to refer to a particular type structure.

So while I can write

    var x = { FirstName = "Riff", LastName = "Raff" }

and then go ahead and access x.FirstName and x.LastName, I can't declare a method signature like this:

    void Display({ string FirstName, string LastName } nameRecord)
    {
    }

This is the kind of thing which is being proposed (along with possible pattern matching/decomposition syntax which is new ground for C#)