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;