The following examples demonstrates how to add separator lines between card "columns".

XAML
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<Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">

  <Grid.Resources>

    <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"

                                    Source="{Binding Source={x:Static Application.Current},

                                                      Path=Orders}"/>

   </Grid.Resources>

   <xcdg:DataGridControl x:Name="OrdersGrid"

                         ItemsSource="{Binding Source={StaticResource cvs_orders}}">

      <xcdg:DataGridControl.View>

         <xcdg:CardView>



           <xcdg:CardView.SeparatorLinePen>

             <Pen Thickness="1.5" Brush="Orange"

                  DashStyle="{x:Static DashStyles.DashDotDot}"/>

           </xcdg:CardView.SeparatorLinePen>

         </xcdg:CardView>

      </xcdg:DataGridControl.View>

   </xcdg:DataGridControl>

</Grid>
VB.NET
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Dim pen As New Pen()

pen.Thickness = 1.5

pen.Brush = Brushes.Orange

pen.DashStyle = DashStyles.DashDotDot



Dim view As New CardView()

view.SeparatorLinePen = pen



dataGridControl.View = view
C#
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Pen pen = new Pen();

pen.Thickness = 1.5;

pen.Brush = Brushes.Orange;

pen.DashStyle = DashStyles.DashDotDot;



CardView view = new CardView();

view.SeparatorLinePen = pen;



dataGridControl.View = view;