DataGridView: Get data from rows

Hi, i'm fresching with powershelle and i want to know if there is an option of DataGridView, that allow to get data from rows without select it. i will more clear... i do a grafical inteface where user insert data on many rows. When he finish to insert data  clicking on ok button and all data will be saved in a txt file or csv.

Thanks for the helpfulness

Cristian