With Source Safe, after I add files to Source Control, they are set read-only locally. So then if I go to Explorer, and check the contents, I can quickly see which files didn't get into source control, because they are still read-write.
With SVN, the software doesn't mark the local files as read-only after check-in, which is fine, but when initially adding an unknown Visual Studio project to SVN, Visual Studio obviously only adds those files that are in its solution. Some supporting files, such as documentation, etc., may be in the source folder, but not added as an item in Visual Studio, so Visual Studio won't add those files. I'll have to manually add them, or I can add those files to Visual Studio's solution, and have Visual Studio do it. But either way, I still need a way to determine which files were not added.
I tried the Lock feature, but that didn't make a difference as far as the local read-only flag of the files.