>Hey John - Once the user clicks on a row in the ListView, how do I get the key value of the customer they clicked on so I can call another Linq query to pull up further details or child records, etc?

XAML:
    <ListView Name="lv2" HorizontalContentAlignment="Stretch" 
              ScrollViewer.VerticalScrollBarVisibility="Visible" 
              SelectionChanged="lv2_SelectionChanged"
              SelectionMode="Single"
              Grid.Row="1">

C#:
   private void lv2_SelectionChanged(object sender, SelectionChangedEventArgs e)
      {
      dataitem d = (dataitem)e.AddedItems[0];  // dataitem being your entity class
      Debug.WriteLine(d.custno.ToString());
      }

Note the SelectionMode="Single" to turn off multi select.