silverlight - ComboBox SelectionChanged event when using ItemTemplate

ComboBox SelectionChanged event when using ItemTemplate 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">
        <Rectangle
            Name="Rectangle1"
            Fill="AliceBlue" 
            HorizontalAlignment="Left" 
            Height="82" 
            Margin="20,12,0,0" 
            Stroke="Black" 
            VerticalAlignment="Top" 
            Width="600"
            StrokeThickness="0"
            />

        <TextBlock 
            Name="TextBlock1" 
            Height="82" 
            HorizontalAlignment="Left" 
            Margin="20,9,0,0" 
            Text="ComboBox SelectionChanged event when using ItemTemplate in silverlight"
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="20"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="600"
            Padding="25,10,10,0"
            />

        <TextBlock 
            Name="TextBlock2" 
            Height="84" 
            HorizontalAlignment="Left" 
            Margin="20,107,0,0" 
            Text="Select An Item From ComboBox"
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="13"
            Foreground="Orchid"
            Width="537"
            />

        <ComboBox
            Name="ComboBox1"
            HorizontalAlignment="Left" 
            Height="100" 
            Margin="20,209,0,0" 
            VerticalAlignment="Top" 
            Width="425"
            SelectionChanged="ComoboBox1_SelectionChanged"
            >
            <ComboBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Orientation="Vertical" Margin="5">
                        <TextBlock
                            Text="{Binding BookName}" 
                            Foreground="MidnightBlue"
                            FontFamily="Georgia"
                            FontWeight="Bold"
                            FontSize="14"
                            TextWrapping="Wrap"
                            Width="380"
                            />
                        <TextBlock 
                            Text="{Binding Author}" 
                            Foreground="DimGray"
                            FontFamily="Comic Sans MS"
                            FontStyle="Italic"
                            TextWrapping="Wrap"
                            Width="380"
                            />
                        <TextBlock 
                            Text="{Binding Price}" 
                            Foreground="Magenta"
                            FontFamily="Courier New"
                            FontWeight="ExtraBlack"
                            TextWrapping="Wrap"
                            Width="380"
                            />
                    </StackPanel>
                </DataTemplate>
            </ComboBox.ItemTemplate>
        </ComboBox>
    </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();

            List<Book> Books = new List<Book>();

            Books.Add(
                new Book(
                        "Ivor Horton's Beginning Visual C++ 2010",
                        "Ivor Horton",
                        "US $54.99"
                        )
                    );

            Books.Add(
                new Book(
                        "Professional C++, 2nd Edition",
                        "Marc Gregoire, Nicholas A. Solter, Scott J. Kleper",
                        "US $44.99"
                        )
                    );

            Books.Add(
                new Book(
                        "Real-World Solutions for Developing High-Quality PHP Frameworks and Applications",
                        "Sebastian Bergmann, Stefan Priebsch",
                        "US $44.99"
                        )
                    );

            Books.Add(
                new Book(
                        "Professional IronPython",
                        "John Paul Mueller",
                        "US $44.99"
                        )
                    );

            Books.Add(
                new Book(
                        "Professional Sitecore Development",
                        "John West",
                        "US $44.99"
                        )
                    );

            ComboBox1.ItemsSource = Books;
        }

        public class Book
        {
            public String BookName { get; set; }
            public String Author { get; set; }
            public String Price { get; set; }

            public Book(String bookname, String author, String price)
            {
                this.BookName = bookname;
                this.Author = author;
                this.Price = price;
            }
        }

        private void ComoboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Book selectedBook = (ComboBox1.SelectedItem) as Book;

            TextBlock2.Text = "Selected Book Name: " + selectedBook.BookName;
            TextBlock2.Text += "\nAuthor: " + selectedBook.Author;
            TextBlock2.Text += "\nPrice: " + selectedBook.Price;
        }
    }
}