Hi!, I already have done this, creating a Windows App where you select the CSV.
I'll give the full source code, no problem, but this is not as easy. Once has to use the Google API v4.0 as the previous methods has been marked by google as deprecated.
Also there is some work to do in the Google Sheet side of things, you will have to Create a Google App (This is not a real App but a series of step that you will have to follow) so I can get the OAuth2.0 Key and Secret that I would have to code into the Windows App so it can access the Google Sheet.
PD: I would also need to see the csv to see if the bidding price makes any justice for the work ahead.
Thanks,
Felice