Where should I put my top level code?

Question

Hi

I'v got with my program this far to start using top level code.

If you look at my scheme you can see the top level is program:

http://tempuri.org/tempuri.html

I need to know where should I put the exchangeCar, login, logout method.

I tried to put them in program.cs, but it gives me "cannot declare instance members in static class" error

I tried to put it in the form.cs but this gives me some inconsistent accessibility error.

I want to know where should I put the methods? Program.cs, Form.cs or create another superclass?

Thank you