[louthy]

The 'cool but funky' thing is LINQ. Language Integrated Query. It can be used to query in-memory lists and arrays as well as build SQL to query a DB, or even query XML files.

It is C#'s support for monads.

In terms of var. It's best not to think of it as dynamic like javascript. You can't do this for example:

    var a = 123;
    a = "Hello";

The second line will throw an exception because 'a' is not a string, it's an int. So it's not dynamic like JS. It simply infers the type when it can so that you don't have to type it, otherwise its exactly the same.

Interestingly C# does have a dynamic aspect too, and that's with the 'dynamic' keyword.

    dynamic x = 123;
    x = "Hello";

That will work where the var example wouldn't. It's a rarely used feature, but comes in useful to avoid boilerplate when dealing with external 'stuff', like XML files, JSON, or REST responses.