Part 4 Complete code (Windows Store apps using C#/VB and XAML)

<common:LayoutAwarePage
    x:Name="pageRoot"
    x:Class="HelloWorld.PhotoPage"
    DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:HelloWorld"
    xmlns:common="using:HelloWorld.Common"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Page.Resources>

        <!-- TODO: Delete this line if the key AppName is declared in App.xaml -->
        <x:String x:Key="AppName">Hello, photo!</x:String>
    </Page.Resources>

    <!--
        This grid acts as a root panel for the page that defines two rows:
        * Row 0 contains the back button and page title
        * Row 1 contains the rest of the page layout
    -->
    <Grid Style="{StaticResource LayoutRootStyle}">
        <Grid.RowDefinitions>
            <RowDefinition Height="140"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!-- Back button and page title -->
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Button x:Name="backButton" Click="GoBack" 
                    IsEnabled="{Binding Frame.CanGoBack, ElementName=pageRoot}" 
                    Style="{StaticResource BackButtonStyle}"/>
            <TextBlock x:Name="pageTitle" Grid.Column="1" 
                       Text="{StaticResource AppName}" Style="{StaticResource PageHeaderTextStyle}"/>
        </Grid>
        <Grid x:Name="contentGrid" Grid.Row="1" Margin="120,0,0,120">
            <Grid.RowDefinitions>
                <RowDefinition Height="50"/>
                <RowDefinition Height="70"/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <Button Content="Get photo" Click="GetPhotoButton_Click"/>
            <TextBlock Grid.Row="1" TextWrapping="Wrap" Text="{Binding DisplayName}" 
                       Style="{StaticResource PageSubheaderTextStyle}"/>
            <StackPanel x:Name="imagePanel" Grid.Row="2" Orientation="Horizontal">
                <Border BorderBrush="Gray" BorderThickness="1" Background="Gray">
                    <Image x:Name="displayImage" Source="Assets/Logo.png"/>
                </Border>
                <StackPanel Margin="20,0,0,0">
                    <TextBlock TextWrapping="Wrap" Text="File name:" 
                               Style="{StaticResource CaptionTextStyle}"/>
                    <TextBlock TextWrapping="Wrap" Text="{Binding Name}" 
                               Style="{StaticResource ItemTextStyle}" Margin="10,0,0,30"/>
                    <TextBlock TextWrapping="Wrap" Text="Path:" 
                               Style="{StaticResource CaptionTextStyle}"/>
                    <TextBlock TextWrapping="Wrap" Text="{Binding Path}" 
                               Style="{StaticResource ItemTextStyle}" Margin="10,0,0,30"/>
                    <TextBlock TextWrapping="Wrap" Text="Date created:" 
                               Style="{StaticResource CaptionTextStyle}"/>
                    <TextBlock TextWrapping="Wrap" Text="{Binding Path}" 
                               Style="{StaticResource ItemTextStyle}" Margin="10,0,0,30"/>
                </StackPanel>
            </StackPanel>
        </Grid>

        <VisualStateManager.VisualStateGroups>

            <!-- Visual states reflect the application's view state -->
            <VisualStateGroup x:Name="ApplicationViewStates">
                <VisualState x:Name="FullScreenLandscape"/>
                <VisualState x:Name="Filled"/>

                <!-- The entire page respects the narrower 100-pixel margin convention for portrait -->
                <VisualState x:Name="FullScreenPortrait">
                    <Storyboard>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" 
                                                       Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PortraitBackButtonStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(StackPanel.Orientation)" 
                                                       Storyboard.TargetName="imagePanel">
                            <DiscreteObjectKeyFrame KeyTime="0">
                                <DiscreteObjectKeyFrame.Value>
                                    <Orientation>Vertical</Orientation>
                                </DiscreteObjectKeyFrame.Value>
                            </DiscreteObjectKeyFrame>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" 
                                                       Storyboard.TargetName="imagePanel">
                            <DiscreteObjectKeyFrame KeyTime="0">
                                <DiscreteObjectKeyFrame.Value>
                                    <Thickness>0,0,20,0</Thickness>
                                </DiscreteObjectKeyFrame.Value>
                            </DiscreteObjectKeyFrame>
                        </ObjectAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>

                <!-- The back button and title have different styles when snapped -->
                <VisualState x:Name="Snapped">
                    <Storyboard>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" 
                                                       Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedBackButtonStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="pageTitle" 
                                                       Storyboard.TargetProperty="Style">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedPageHeaderTextStyle}"/>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Margin)" 
                                                       Storyboard.TargetName="contentGrid">
                            <DiscreteObjectKeyFrame KeyTime="0">
                                <DiscreteObjectKeyFrame.Value>
                                    <Thickness>20,0,0,20</Thickness>
                                </DiscreteObjectKeyFrame.Value>
                            </DiscreteObjectKeyFrame>
                        </ObjectAnimationUsingKeyFrames>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(StackPanel.Orientation)" 
                                                       Storyboard.TargetName="imagePanel">
                            <DiscreteObjectKeyFrame KeyTime="0">
                                <DiscreteObjectKeyFrame.Value>
                                    <Orientation>Vertical</Orientation>
                                </DiscreteObjectKeyFrame.Value>
                            </DiscreteObjectKeyFrame>
                        </ObjectAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>
            </VisualStateGroup>
        </VisualStateManager.VisualStateGroups>
    </Grid>
</common:LayoutAwarePage>

using System;
using System.Collections.Generic;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace HelloWorld
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class PhotoPage : HelloWorld.Common.LayoutAwarePage
    {
        private string mruToken = null;

        public PhotoPage()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected async override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            if (pageState != null && pageState.ContainsKey("mruToken"))
            {
                object value = null;
                if (pageState.TryGetValue("mruToken", out value))
                {
                    if (value != null)
                    {
                        mruToken = value.ToString();

                        // Open the file via the token that you stored when adding this file into the MRU list.
                        Windows.Storage.StorageFile file =
                            await Windows.Storage.AccessCache.StorageApplicationPermissions.MostRecentlyUsedList.GetFileAsync(mruToken);

                        if (file != null)
                        {
                            // Open a stream for the selected file.
                            Windows.Storage.Streams.IRandomAccessStream fileStream =
                                await file.OpenAsync(Windows.Storage.FileAccessMode.Read);

                            // Set the image source to a bitmap.
                            Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapImage =
                                new Windows.UI.Xaml.Media.Imaging.BitmapImage();

                            bitmapImage.SetSource(fileStream);
                            displayImage.Source = bitmapImage;

                            // Set the data context for the page.
                            this.DataContext = file;
                        }
                    }
                }
            }
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
            if (!String.IsNullOrEmpty(mruToken))
            {
                pageState["mruToken"] = mruToken;
            }
        }

        private async void GetPhotoButton_Click(object sender, RoutedEventArgs e)
        {
            // File picker APIs don't work if the app is in a snapped state.
            // If the app is snapped, try to unsnap it first. Only show the picker if it unsnaps.
            if (Windows.UI.ViewManagement.ApplicationView.Value != Windows.UI.ViewManagement.ApplicationViewState.Snapped ||
                 Windows.UI.ViewManagement.ApplicationView.TryUnsnap() == true)
            {
                Windows.Storage.Pickers.FileOpenPicker openPicker = new Windows.Storage.Pickers.FileOpenPicker();
                openPicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.PicturesLibrary;
                openPicker.ViewMode = Windows.Storage.Pickers.PickerViewMode.Thumbnail;

                // Filter to include a sample subset of file types.
                openPicker.FileTypeFilter.Clear();
                openPicker.FileTypeFilter.Add(".bmp");
                openPicker.FileTypeFilter.Add(".png");
                openPicker.FileTypeFilter.Add(".jpeg");
                openPicker.FileTypeFilter.Add(".jpg");

                // Open the file picker.
                Windows.Storage.StorageFile file = await openPicker.PickSingleFileAsync();

                // file is null if user cancels the file picker.
                if (file != null)
                {
                    // Open a stream for the selected file.
                    Windows.Storage.Streams.IRandomAccessStream fileStream =
                        await file.OpenAsync(Windows.Storage.FileAccessMode.Read);

                    // Set the image source to the selected bitmap.
                    Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapImage =
                        new Windows.UI.Xaml.Media.Imaging.BitmapImage();

                    bitmapImage.SetSource(fileStream);
                    displayImage.Source = bitmapImage;
                    this.DataContext = file;

                    // Add picked file to MostRecentlyUsedList and get a token.
                    mruToken = Windows.Storage.AccessCache.StorageApplicationPermissions.MostRecentlyUsedList.Add(file);
                }
            }

        }
    }
}