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Chart for WPF and Silverlight / Chart Features / Markers Labels / Line and Dot Marker
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    Line and Dot Marker
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    For an Area or Line chart, you might want a marker that marks the whole X- or Y-axis and the data point. For visual reference, a line and dot marker will resemble the following image:



    To create such a marker, one of the most important properties to set is the VerticalAlignment property. When you set this property to "Stretch", then the marker is stretched to the entire plot height, giving the vertical line. Here are the properties that you'll set in the markup:

    Note that you're setting the Y part of the data point to NaN. This will also help to give  full vertical line, since the marker will never attach itself to a specific data point. The circular label in the image above is another ChartPanelObject that will be positioned on the plot element. It's DataPoint property will be something other than NaN.

    You can create this effect just using XAML markup, no code required!

    Copy Code
    <!-- vertical line and dot markers -->
    <c1:ChartPanelObject x:Name="vline"
                         DataPoint="-1, NaN"
            <Border Background="Black" BorderBrush="Black" Padding="1" BorderThickness="1 0 0 0" />
    <c1:ChartPanelObject x:Name="dot"
        <Grid DataContext="{Binding RelativeSource={x:Static RelativeSource.Self},Path=Parent}">
            <Ellipse Fill="White" Stroke="Black" StrokeThickness="1" Width="30" Height="30" />
            <TextBlock x:Name="label" Text="{Binding DataPoint.Y, StringFormat=n0}" FontWeight="Bold" VerticalAlignment="Center" HorizontalAlignment="Center"/>





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