check .Net framework version

1. XFxDetect - A utility to detect which versions of .Net are installed
2. How to: Determine which .NET Framework versions are installed
3. How to determine which .NET Framework security updates and hotfixes are installe
4. Upgrade C++ projects from earlier versions of Visual Studio
5. Old csproj to new csproj: Visual Studio 2017 upgrade guide
6. Visual Studio Project Converter