In case readers have not tried the SourceHeader Updater of Visual Smarter, it may be worth of. It looks like the following:
As can be seen, it has quite some header information that can be put at the top of each source file, e.g. Project Name, Source File, Description, Copyright, Author, Email, Date, and revision History.
The tool can exclude some automatic files that are generated by Visual Studio or the AssemblyInfo file. In the single dialog, all available files in the current project can be navigated one by one. More and better, all headers can be cleaned up with a single click, if really necessary; or the current can be cleared, removed, or updated with the right button.