Present Movies List. Click Button "Clear" will delete all data from view and database

MovieListView.xaml

<Page
    x:Class="SimpleMVVM.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:SimpleMVVM"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    DataContext="{Binding Source= {StaticResource ViewModelLocator}, Path=MovieListViewModel}"
     >

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <TextBlock Grid.Row="0" Text="Movie List" Margin="10" />
        <StackPanel Orientation="Vertical" Grid.Row="1">
                <ListBox Margin="10" 
                     ItemsSource="{Binding Movies, Mode=TwoWay}"
                     SelectedItem="{Binding SelectedMovie, Mode=TwoWay}"
                     Height="250" 
                     Width="Auto"
                     MaxWidth="450"
                     HorizontalAlignment="Left"
                     ScrollViewer.VerticalScrollBarVisibility="Auto" 
                     >
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Vertical">
                                <TextBlock Text="{Binding Name, Mode=TwoWay}"/>
                                <TextBlock Text="{Binding Price, Mode=TwoWay}"/>
                            </StackPanel>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
                <Button Margin="10" Command="{Binding DeleteAllMoviesCommand}" Content="Clear all"/>
            </StackPanel>            
    </Grid>
</Page>