Visual Studio SQLite

https://nickcharlton.net/posts/sqlite-with-csharp.html

http://swinbrain.ict.swin.edu.au/wiki/Create_a_SQLite_Database

SQLite Password

http://stackoverflow.com/questions/1381264/password-protect-a-sqlite-db-is-it-possible

SQLiteConnection conn = new SQLiteConnection("Data Source=MyDatabase.sqlite;Version=3;");
conn.SetPassword("password");
conn.open();

then next time you can access it like

conn = new SQLiteConnection("Data Source=MyDatabase.sqlite;Version=3;Password=password;");
conn.Open();

This wont allow any GUI editor to view Your data.
Later if you wish to change the password, use

conn.ChangePassword("new_password");

To reset or remove password, use

conn.ChangePassword(String.Empty);