C# Programming/Keywords/await

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