Hello Vikas.
Unfortunately, the result is the same and the sample doesn't really correspond to my solution structure.
What I have : an App project which calls a form from another reference project (a dynamic library project).
What I tested : resx file referred in each project separately (no result) then in the two projects in the same time (no result too). For details, the App project refers the french resx in its resources folder and its main method sets the culture and UIculture to fr. It calls the form from the library project. In this other project, dedicated to UI forms, the culture is also set in the form constructor and this project also contains the resx file in its Resources folder...
The result is that no translation is retrieved (even original english ones), the displayed strings are string keys like "SaveDocument" or "PrintDocument".
Didn't manage to translate it into french ("fr-FR").
Maybe these last details could make the state clearer.
Thanks in advance for your help.