You should know that Silverlight comes with win form drawing software is different, it has no the label property. So, if you want to let data points shown on the columns. You must use Style property.

As follows:

1. Set up style on Application

ColumnSeries series = new ColumnSeries();//Create series

series.ItemsSource = KPIData;//Bind data

series.IndependentValueBinding = new System.Windows.Data.Binding("UserName");//Bind Rows

series.DependentValueBinding = new System.Windows.Data.Binding("Score");//Bind cells

series.AnimationSequence = AnimationSequence.FirstToLast;//Sequence

Style style = (Style)Application.Current.Resources["MyColumnDataStyle"];//Get DataPoint labels

2.   Configure Application

Add in App.xaml

<Application.Resources>

<Style TargetType="charting:ColumnDataPoint" x:Key="MyColumnDataStyle">

<Setter Property="Template">

<Setter.Value>

<ControlTemplate TargetType="charting:ColumnDataPoint">

<Grid>

<Rectangle Fill="{TemplateBinding Background}" Stroke="Black"/>

<Grid Margin="0 -20 0 0" HorizontalAlignment="Center" VerticalAlignment="Top">

<TextBlock Text="{TemplateBinding FormattedDependentValue}" Margin="2"/>

</Grid>

</Grid>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

</Application.Resources>

</Application>

3. Show data points labels