Visual Studio 2013 C# Web Project builds but IDE reports The type or namespace name xxx could not be found error

Question

When opening an MVC4 C# web project in Visual Studio 2013, the IDE reports the error \"The type or namespace name \'_\' could not be found (are you missing a using

Answer 1

My solution, when I encountered the problem with VS 2013 Express edition was to simply unload the offending project and reload. Opening the SUO or Project file and making changes had not affect.