Code that can check CSV file has been process or not

Question

Hi, wanna ask question

 

Is there any code that can check which CSV file has not been read yet in c#?

I want to create windows service, and that windows service can read CSV files and push into database.

after finish save in the database, the service will continuously loop and look at which CSV file has not been read yet.

 

If there any code, can someone teach me

 

thank you

I'm using visual studio 2019, c#