Hello ernisse,
Upload your app to LE, ssh to LE, type mono app name at the command line.
If you provide me with an app, I will gladly provide you with more detailed explanations.
I hope this answers your question.
Thank you very much for your response and it reinforced that I was doing things correctly. I get an entry point error on Libreelec but the same ap work on ubunto and other distros with mono installed. I will now start to work on the app itself to see what differences exist. Eventually I want the app to run from the advanced launcher from within Kodi. Unfortunatley the app requires a supporting database server so posting it would do no good. You have been extremely helpful, thank you.