CHAPTER 30
Asynchronous methods
An asynchronous method is a method that can return before it has finished executing. Any method that performs a potentially long running task, such as accessing a web resource or reading a file, can be made asynchronous to improve the responsiveness of the program. This is especially important in graphical applications, because any method that takes a long time to execute on the user interface thread will cause the program to be unresponsive while waiting for that method to complete.
Async and await
Introduced in C# 5.0, the async and await keywords allow asynchronous methods to be written with a simple structure ...
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