MainPage.xaml

<phone:PhoneApplicationPage 
    x:Class="DataVisualizationOnWindowsPhone.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:charting="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit"
    xmlns:local="clr-namespace:DataVisualizationOnWindowsPhone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="PortraitOrLandscape" Orientation="Portrait"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="800"
    shell:SystemTray.IsVisible="False">

    <phone:PhoneApplicationPage.Resources>
        <!-- Data -->
        <local:Activities x:Key="Activities"/>
    </phone:PhoneApplicationPage.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!-- Title -->
        <TextBlock
            Grid.Row="0"
            Text="DataVisualizationOnWindowsPhone"
            Style="{StaticResource PhoneTextNormalStyle}"/>

        <Grid Grid.Row="1">

            <!-- Chart sample -->
            <charting:Chart
                x:Name="myChart"
                Title="static chart"
                LegendTitle="legend"
                Style="{StaticResource PhoneChartStyle}"
                Template="{StaticResource PhoneChartPortraitTemplate}">

                <!-- Series -->
                <charting:PieSeries
                    ItemsSource="{StaticResource Activities}"
                    DependentValuePath="Count"
                    IndependentValuePath="Activity">
                    <charting:PieSeries.LegendItemStyle>
                        <Style TargetType="charting:LegendItem">
                            <Setter Property="Margin" Value="5 0 5 0"/>
                        </Style>
                    </charting:PieSeries.LegendItemStyle>
                </charting:PieSeries>

            </charting:Chart>
        </Grid>
    </Grid>
    
</phone:PhoneApplicationPage>