The "Async Targeting Pack for Visual Studio 11" enables projects targeting .NET Framework 4.0 or Silverlight 5 to use the Async language feature in C# and Visual Basic.
This pack requires Visual Studio 11 and will not work with Visual Studio 2010.
The pack contains the API support necessary to use the 'async' and 'await' keywords in C# 5.0 and Visual Basic 11, as well as a set of Task-based adapter APIs that allow using some of the existing asynchronous APIs with the new language keywords.
This targeting pack is not required for projects targeting .NET Framework 4.5 or .NET for Metro style apps. It is only required for projects targeting Silverlight 5 and .NET Framework 4.0. Earlier platform releases are not supported.
More info: http://go.microsoft.com/fwlink/?LinkId=250980.
This package has no dependencies.