C# how to compile programmatically while embedding .resx resource file

Question

This question might seem dumb, but I cannot quite understand the concept of C# compilation

I'm working on a C# project that contains two merged solutions The first solution saves settings in the form of.resx resources files and the second solution reads them in said resx file located in roaming directory using Resource Writer and resource reader.

Now my problem is that I want the first solution to be able to compile the second solution's exe file while merging or embedding the resx file that contains the saved settings.

I'm not sure what should I do or what should I use or how to do this, this is my first time working on something that manually compiles the solution, I would've searched it on the internet but there are not a lot of tutorials concerning this specific matter, I felt lost and thus I'm seeking help from this forum in the hopes of finding a fix for this frustrating matter.