Would this be possible to do with unity

I am about to begin making a game. It will be online in the future but for now I was wondering. Would it be possible for me to make a program with microsoft visual C# express that basicly works as a database. A never ending list, a player makes an account in the game, the game calls upon the program made with MS express, adds the players info. The player tries to login to the game, calls upon the program and retrieves the information. Basicly importing/exporting data between unity and the program.

Would this type of system work?

Well it can work.You can Export data with JSON from your C# app and then you can read this file from Unity(or contrary) side with miniJSON or something similar.

We have created a game that was working in a similar way with php and Unity working together.