C Sharp Programming/Keywords/async

The and  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 must be used to modify a method or lambda expression that contains an  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 = getLargeDataSet; and add the  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.

/Keywords