Merge two versions of C# projects
<p>I am working on documenting a winForms project that isn't completely done being written, meaning there is another programmer who write the code right now. So I've already wrote some importent comments in a copy of the project.
In addition I use sandcastle to bulid the help file.</p>

<p>My question: what is the best way (if there is one) to copy the comments from the old copy of the project to the new version of it?
Maybe sandcastle can do something like import a documentation to a project?</p>

<p>I know it wasn't so smart to do so, still I have to check if there is a way to save the documentation work.</p>