DataGrid (ItemsSource = Database Table) - additional column: How to keep changes when (re-)sorting the DataGrid?

Hey guys,

got a tricky question here: I have a DataGrid that's being filled (DataGrid.ItemsSource) by an Access Table.

What's best practice to show additional columns for the user and keep changes in this column upon (re-)sorting?

In my case the additional column is a CheckBoxColumn for the user, to select those lines in the DataGrid he wants to edit. The checks disappear if you sort the DataGrid.

Code:

DataTable dtResult; // as global
using (OleDbConnection connection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + "Test.accdb"))
{
    string strDbCmd = "SELECT * FROM Table1";
    OleDbDataAdapter daOleDb = new OleDbDataAdapter(strDbCmd, connection);
    dtResult = new DataTable();
    daOleDb.FillSchema(dtResult, SchemaType.Source);
    daOleDb.Fill(dtResult);
    DataGrid1.ItemsSource = dtResult.DefaultView;
    DataGridCheckBoxColumn dgCol = new DataGridCheckBoxColumn();
    DataGrid1.Columns.Insert(0, dgCol);
}
I cannot alter dtResult as I later on will use that to update the database:
// Later on somewhere else:
OleDbDataAdapter daOleDb = new OleDbDataAdapter(strDbCmd, connection);
// [...]
daOleDb.Update(dtResult);

Now of course I could store all checks in a bool array or anything, but is there a clever solution to keep checks set upon sorting the DataGrid?

Kinds regards!