I've downloaded your .zip solution but it includes dlls in packages got through Nuget, i.e. dlls for targeting .NET 4.0 from VS2012 and runnable from from machine with installed .NET 4.5 only. One also cannot use C# 5.0 extensions for targeting .NET 4.0 from VS 2012 on VS2010 through Async Targeting Pack
In order to use async/await in VS2010 one should not use Nuget or .NET 4.0 upgraded by .NET 4.5 installation (in other words, to have .NET 4.5 installed).
See my answers to:
- Async CTP not working in VS 2010 SP1
- Where can I find a TPL dataflow version for 4.0
with details on how to get and use C# 5.0 extensions in .NET 4.0 (without .NET 4.5/VS2012 installed) - Asynchronous Programming with Async and Await
Update:
Once again, citing the answer from "Proper way to use Async with VS 2010 now that VS 2012 is released"
"The Async CTP is the only way to use async in Visual Studio 2010. However, it is not the async that made it into .NET 4.5 / Visual Studio 2012"
There was also a big hot discussion in MSDN forums:
- "If I target .net 4.0 but run on a machine that has .net 4.5 will .net 4.0 WPF bugs still be there?"
The title is a little bit misleading since the discussion shifted to impossibility to develop/test .NET 4.0 (om machine without .NET 4.5 installed) from VS2012 and/or from machine with .NET 4.5