Inline IL in C#?

"C# as a programming language is still young and has evolved nicely in the last few years: most of the new features take it closer to a high-level language, allowing shorter and nicer code for common patterns. A language needs to be able to cover a wide spectrum of usages to be considered mature but there is one side of the spectrum that has been neglected in C# for far too long: the low level side close to IL code."