Getting “type or namespace name could not be found” but everything seems ok?

Question

I\'m getting a:

type or namespace name could not be found

error for a C# WPF app in VS2010. This area of code was compiling fine

Answer 1

A trickier situation I ran into was: Project one targets the 4.0 full framework with Microsoft.Bcl.Async package installed. Project two target the 4.0 full framework but would not compile when reference a Project one class.

Once I installed the Async NuGet package on the second project it compiled fine.