silverlight - How to use Calendar SelectedDatesChanged event

how to use Calendar SelectedDatesChanged event in silverlight
MainPage.xaml

<UserControl x:Class="SilverlightApps.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="600" 
    d:DesignWidth="800" 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">

    <Grid x:Name="LayoutRoot" Background="White">
        <TextBlock 
            Height="82" 
            HorizontalAlignment="Left" 
            Margin="20,12,0,0" 
            Name="textBlock1" 
            Text="Silverlight - how to use Calendar SelectedDatesChanged event" 
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="25"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="750"
            />

        <sdk:Label 
            HorizontalAlignment="Left" 
            Margin="94,111,0,0" 
            Name="label1" 
            VerticalAlignment="Top" 
            Width="400"
            Content="Select A Date."
            FontSize="25"
            Foreground="DeepPink"
            />

        <sdk:Calendar 
            Height="169" 
            HorizontalAlignment="Left" 
            Margin="132,179,0,0" 
            Name="calendar1" 
            VerticalAlignment="Top" 
            Width="230" 
            SelectedDatesChanged="calendar1_SelectedDatesChanged"
            SelectionMode="SingleDate"
            />
    </Grid>
</UserControl>
MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApps
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void calendar1_SelectedDatesChanged(object sender, SelectionChangedEventArgs e)
        {
            label1.Content = calendar1.SelectedDate.Value.ToLongDateString();
        }
    }
}
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