C# Programming/Keywords/async

The async and await contextual keywords are used in asynchronous programming. Asynchronous programming allows a process to wait until a method completes and returns a value (or times out or otherwise fails). The keyword async must be used to modify a method or lambda expression that contains an await expression or method. These two keywords make asynchronous programming easy to implement. Simply preface any potentially long-running call with the await keyword, e.g., var text = await getLargeDataSet(); and add the async modifier to the containing method (or lambda expression). The async and await keywords are available in JavaScript and other languages and were introduced in C# version 5.0.

C# Keywords
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using var virtual void volatile while
Special C# Identifiers (Contextual Keywords)
add alias async await dynamic get global nameof partial remove set value when where yield
Contextual Keywords (Used in Queries)
ascending by descending equals from group in into join let on orderby select where