I am working in a Web Project in Visual Studio 2008. When I hit F12 (or right-click and select Go To Definition) Visual Studio is consistently going to the Metadata file in
In my case, (using Visual Studio Professional 2015), when I had disabled the XAML designer, the F12 stopped working. As soon as I revert the changes, and restart Visual Studio, the F12 worked again.
Checked the pattern multiple times to confirm and then posted. Hope it helps someone.
Looks like it needs to be setup in Resharper as well. My Visual Studio does not navigate to .NET Framework source code until I enable it in Resharper.