Unable to update DataGridView

Question

I am doing a simple application with a MSaccess MDB database.
I have two Table and one DataGridView.
Access File had been added with the wizard of visual studio and the DataGridView binded to Table Two the source using the form UI.
Table One is full with 929 rows and Table Two is empty.
I'd like to select rows from Table One and Import on Table Two.
- How can I select a row checking a value inside a field, if the value is calculated inside the program?
- Why the DataGridView is not updated with the selection of rows?
I tryed also with tableadapter.update or similar, but is not functioning.

Thanks for Help.
Stefano