How to iterate (list) all selected items in a Databound ListBox in .NET 4.0 Winforms

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A seemingly easy thing to do that I could not find documentation for!

string astr;
foreach (DataRowView aRow in listBox1.SelectedItems )
{
    astr = aRow["TopicId"].ToString();
    astr = aRow["TopicText"].ToString();
}

TopicId and TopicText are the name of the columns in the table of the Datasource that has been bound to the listbox control.

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