This extension copies the text you selected in file with it's location: the class and the method, code block belongs to, and the line number.
Assume, you selected such a string:
You can copy that string with its location using menu Edit -> Copy with location or by using a toolbar button:
After it your buffer will contain text:
ExtendedCopier.CopySelectionWithLocation:14: var activeDocument = dte.ActiveDocument;
This extension has got several options. Go to Tools -> Options -> Copy with location to customize copying formats.
You can load source code or contribute at https://bitbucket.org/ishatalkin/visual-studio-extensions.