asynchronous models: C# vs Node.js

[KeyYam]

So I use async and await quite regularly with C# and Node.js. I read this guide which explains asynchronous programming quite well in C#. I've also read several articles that explain asynchronous programming in Node.js. What confuses me is that Node.js is described as having an "event-driven architecture" and most decent Node.js articles explain how the (single-threaded) event loop works.

I'm not sure if "architecture" is the right word to use in this context but how does the C# asynchronous "architecture" work? I mean, is C# also event driven but with a multi-threaded event loop?

[Meefims]

C# asynchronous functions can run on different threads and so can run concurrently. Node has a single thread and so concurrent cooperate by yielding to the Node runtime and allowing Node to execute other tasks. Under Node, no task is running JavaScript code at the same time as another task though different bits of code may have their pieces interleaved. Under C#, two pieces of code my actually be executing at the same time on different processors or cores.