Can I use TombstoneHelper Class in Windows Phone 8 - windows-phone-8

Question

I had Windows Phone 8. When I put my app in background and then when I start after some time it seems me a black because of Tombstone. I have found the solution which is the TombstoneHelper class. But I had a little question whether it can support Windows Phone 8. Because everywhere I look I only found Wp7 TombstoneHelper. So it is a little confusing.I had two TextBox in my app they comes null after Tombstone.Here is my xaml Code:
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<Grid.RowDefinitions>
<RowDefinition Height="70"/>
<RowDefinition Height="70"/>
<RowDefinition Height="70"/>
<RowDefinition Height="70"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<TextBlock Text="Firstname :" Grid.Row="0" Grid.Column="0"/>
<TextBox Text=""
Grid.Row="0" Grid.Column="1"/>
<TextBlock Text="Lastname :" Grid.Row="1" Grid.Column="0"/>
<TextBox
Grid.Row="1" Grid.Column="1"/>
<TextBlock x:Name="txt" Text="" Grid.Row="2"></TextBlock>
</Grid>
</Grid>
And the C# code is :
`public MainPage()
{
InitializeComponent();
}
protected override void znNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)
{
this.SaveState(e, typeof(TextBox));
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
this.RestoreState();
}`

Answer 1

Yes you can use it. See my Twitter conversation with Matt Lacey, the man behind TombstoneHelper