一对多DataBase中的布尔值

I'm trying to create a form to assign a seat in various classroom for each lesson. I created a database with access that contain two table: Tabel1: Lesson, Day, Hours, Number of seats in that classroom. Then i created a second table (Tabel2) in one to many relationship with the first: for every lesson it will be the right number of seats (each number represents one seats)and a boolean value (true if the seat is free, false otherwise). I already connected the DB to my project in Visual Studio. With the ADD button (and then SAVE) I can assign the parameters of a lesson with the value in the textboxes. Here the code:I'm trying to create a form to assign a seat in