One of the previous projects was developed using Vs2008, because there was something in the family that could only be negotiated with the manager at home to do the project, because home vs was 2013 so there was nothing wrong with the migration, but today I changed the file of a class library and rebuilt the solution results with the following issues:
Error 101 The Type or namespace name ' * * * * could not being found (is you missing a using directive or an assembly reference ?)
This means that the type or namespace is not found, and the referenced component appears in the class library reference with an exclamation point (the above error is the component's Class)
Some people on the network say that because of the issue of the framework version, and then look at the properties of these two class libraries to find that the target framework of the two class libraries is not the same, the two framework unified after the successful resolution of the problem
But the strange thing is that the previous use of Vs2008 has never experienced this problem, I do not know Vs2013 why this problem
Reference: Rookie to rookie--the type or namespace name ' * * * * could not being found (is you missing a using directive or an assembly REFERENC E
From for notes (Wiz)
Vs2013 the target framework problem of the pit daddy