Visual Studio skips build
Check with the configuration manager like CMS said and make sure that you have the right platform set. A lot of the time when you use something like the MS Application Blocks the default platform is set to Itanium.
Check on your solution properties, then go to "Configuration Properties", and make sure that all the projects that you want to build, have the build flag checked:
Yet another reason why this could happen (as it happened to me):
When your VS installation is missing x64 compiler toolchain, and you're building for x64.
To solve this, find MSVS in appwiz.cpl ("Programs and Features"), click "Uninstall/Change", then go to the x64 toolchain checkbox under C++ and check it.