C# has essentially put a common name to many existing CS features and popularized particular forms of them. A bunch of modern C# features are actually lifted f

C# has essentially put a common name to many existing CS features and popularized particular forms of them. A bunch of modern C# features are actually lifted from F#, which had them first on the .NET platform. Sometimes the C# version is simplified or has some of the sharp edges filed off (which makes it less powerful, but safer). Async/await is definitely one of these.