Visual Studio Pre or Post Build Event

If the CodeLinker EXE was copied to the Solution's root folder the post-build events would look like this ...

$(SolutionDir)CodeLinker.exe \_Builds\CodeLinker-3.5\CodeLinker-3.5.csproj
$(SolutionDir)CodeLinker.exe \CodeLinkerGui\CodeLinkerGui.csproj
$(SolutionDir)CodeLinker.exe \_Builds\CodeLinker-3.5\CodeLinkerGui-3.5.cspro

In each case of the above the destination project contains the source: etc information to Link code into itself.
Note the order here - CodeLinkerGui.csproj is done before CodeLinkerGui-3.5.csproj because CodeLinkerGui-3.5 depends on CodeLinkerGui

They are only like below because this project is so ridiculously self-referential...

$(TargetPath) ..\..\..\_Builds\CodeLinker-3.5\CodeLinker-3.5.csproj
$(TargetPath)  ..\..\..\CodeLinkerGui\CodeLinkerGui.csproj
$(TargetPath)  ..\..\..\_Builds\CodeLinker-3.5\CodeLinkerGui-3.5.csproj

...this is an edge-case but a good example of relative paths.