Hidden Features of C#?

This came to my mind after I learned the following from this question:

where T : struct

We, C# developers, all know the basics of C#. I mean declarations, conditionals, loops, operators, etc. Some of us even mastered the stuff like Generics, anonymous types, lambdas, LINQ, ... But what are the most hidden features or tricks of C# that even C# fans, addicts, experts barely know ?

Here are the revealed features so far:

Keywords

yield by Michael Stum
var by Michael Stum
using() statement by kokos
readonly by kokos
as by Mike Stone
as / is by Ed Swangren
as / is (improved) by Rocketpants
default by deathofrats
global:: by pzycoman
using() blocks by AlexCuse
volatile by Jakub Šturc
extern alias by Jakub Šturc

Attributes

DefaultValueAttribute by Michael Stum
ObsoleteAttribute by DannySmurf
DebuggerDisplayAttribute by Stu
DebuggerBrowsable and DebuggerStepThrough by bdukes
ThreadStaticAttribute by marxidad
FlagsAttribute by Martin Clarke
ConditionalAttribute by AndrewBurns

Syntax

?? (coalesce nulls) operator by kokos
number flaggings by Nick Berardi
where T:new by Lars Mæhlum
implicit generics by Keith
one-parameter lambdas by Keith
auto properties by Keith
namespace aliases by Keith
verbatim string literals with @ by Patrick
enum values by lfoust
@variablenames by marxidad
event operators by marxidad
format string brackets by Portman
property accessor accessibility modifiers by xanadont
conditional (ternary) operator (?:) by JasonS
checked and unchecked operators by Binoj Antony
implicit and explicit operators by Flory

Language Features

Nullable types by Brad Barker
Currying by Brian Leahy
anonymous types by Keith
__makeref __reftype __refvalue by Judah Himango
object initializers by lomaxx
format strings by David in Dakota
Extension Methods by marxidad
partial methods by Jon Erickson
preprocessor directives by John Asbeck
DEBUG pre-processor directive by Robert Durgin
operator overloading by SefBkn
type inferrence by chakrit
boolean operators taken to next level by Rob Gough
pass value-type variable as interface without boxing by Roman Boiko
programmatically determine declared variable type by Roman Boiko
Static Constructors by Chris
(more..)

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