DevLib.Legacy.Async (nuget): https://devlib.codeplex.com/  Async Await for .NET 4.0  DevLib is a highly reusable collection of components and core functionalities addressing common crosscutting concerns. It provides a comprehensive set of features that save development time, minimize costs, reduce the use of precious test resources, and decrease the overall maintenance effort.  It is time to boost your productivity.
Keywords: legacy|.net|await|async|Task