Get list of selected from Mutiple selection DataGrid

I am using a multi-select datagrid (as found here: Blazor DataGrid multiple selection) and is working. First column is an ID column from DB. I then have a button that I want to take all of the selected records and do a bulk update.

How do I get the list of selected records? Specifically, a list of all the selected ID's?

This has been resolved. Found this topic on the forum