the name <…> does not exist in the namespace clr-namespace <…>

Question

I have a small WPF application which used to compile just fine but is not anymore. I can\'t really say at which point it stopped building. It just worked fine one day, and t

Answer 1

This is a recurring problem for me. One of the time I found the solution looking into the Warning tab. It was a .NET framework version issue and it stated the following:

Warning 9 The primary reference "myDll" could not be resolved because it was built against the ".NETFramework,Version=v4.5.2" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0".