C # has a very good framework , this would help a lot when creating a webservice server between the client and the database.
Delphi already has many components that help when developing a commercial automation application.
Is there any impediment in using both together? Objectively, would it be correct to use them together?
Each case is a case.
You can use both and have them communicate through webservices . The intention of webservice , which is not always the best solution, is precisely technologies that can communicate without understanding the details of the communication and operation of the other party. It is used to standardize the access to data of an application by another application.
Of course I would try to make a homogenous application where possible. And it seems to me that this case is not only possible, it is desirable.
I doubt it's worth the trouble to create webservices to take advantage of a component that will help you with some task. Something that can probably be done easily also in C # and that should have something ready to use with this language. But if you need webservices for other reasons, you already have advantages there.
That is, understand why you are choosing each one. But do not separate the application into two just because one language has better components for one thing and the other has better components for another.
