silverlight - How to use ListBox SelectionChanged event

how to use ListBox SelectionChanged 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 ListBox SelectionChanged event" 
            VerticalAlignment="Top"
            TextWrapping="Wrap"
            FontSize="25"
            FontStyle="Italic"
            Foreground="MidnightBlue"
            Width="625"
            />

        <ListBox 
            Name="listBox1"
            HorizontalAlignment="Left" 
            Height="132" Margin="20,127,0,0" 
            VerticalAlignment="Top" 
            Width="154"
            SelectionMode="Single"
            SelectionChanged="ListBox1_SelectionChanged"
            >
            <ListBoxItem Content="India"></ListBoxItem>
            <ListBoxItem Content="Barbados"></ListBoxItem>
            <ListBoxItem Content="Costa Rica"></ListBoxItem>
            <ListBoxItem Content="Guatemala"></ListBoxItem>
            <ListBoxItem Content="Kenya"></ListBoxItem>
        </ListBox>

        <sdk:Label 
            Name="label1"
            HorizontalAlignment="Left" 
            Height="28" Margin="203,127,0,0" 
            VerticalAlignment="Top" 
            Width="264" 
            Content="Select An Item"
            FontWeight="Bold"
            Foreground="DeepPink"
            FontSize="12"
            />
    </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 ListBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ListBoxItem lbi = ((sender as ListBox).SelectedItem as ListBoxItem);
            label1.Content = "You selected: ";
            label1.Content += lbi.Content.ToString();
        }
    }
}