Visual Basic 2015 Unleashed

The Old-Fashioned Way: Event-Based Asynchrony

More often than not, applications need to perform multiple tasks at one time, while still remaining responsive to user interaction. One of the possibilities offered by the .NET Framework since the early days is the Event-based Asynchronous Pattern (EAP). A class that adheres to this pattern implements a number of methods whose names terminate with the Async suffix and that execute some work on a different thread. Such methods mirror their synchronous counterparts, which instead block the caller thread. Also, for each of these asynchronous methods, there is an event whose name terminates with the Completed suffix and that is raised when the asynchronous operation completes. This way, the caller gets ...