Discussion :

[Battosaiii]

A quoi ca rime ce message ?J'obtiens ce message quand j'appuie sur le bouton "start debugging" de mon projet...

L'exact message que j'obtiens est :

a project with an Output Type of Class cannot started directly.

In order to debug this project, add an executable project
to this solution which references the library project.
Set the executable project as the startup project.