Quit application from a user Control - wpf

Question

I have a MainWindow in my application. The MainWindow hosts a UserControl in its ContentControl(I call this MainPage). MainPage goes onto hosts another UserControl which contains all sorts of controls on it (KiviPage).
I am trying to connect to a database in MainPage and load a file in the KiviPage. If any of the two operations fail (connection to database or file loading) I have to quit the application. Which means I have to quit the application from the user controls.
Whats the best way to do this?

Answer 1

Simply call "Shutdown" from code behind of the user control:
Application.Current.Shutdown();

Answer 2

I think, you may implement this action through a attached DependencyProperty. Something like that (it's a simple work example):
XAML
<Window x:Class="ShutdownAppHelp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ShutdownAppHelp"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="{x:Type CheckBox}">
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="local:ProgramBehaviours.Shutdown" Value="True" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<CheckBox Content=" Shutdown" IsChecked="False" />
</Grid>
</Window>
Code behind
namespace ShutdownAppHelp
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
}
public static class ProgramBehaviours
{
// Shutdown program
public static void SetShutdown(DependencyObject target, bool value)
{
target.SetValue(ShutdownProperty, value);
}
public static readonly DependencyProperty ShutdownProperty =
DependencyProperty.RegisterAttached("Shutdown",
typeof(bool),
typeof(ProgramBehaviours),
new UIPropertyMetadata(false, OnShutdown));
// Here call function in UIPropertyMetadata()
private static void OnShutdown(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if (e.NewValue is bool && ((bool)e.NewValue))
{
Application.Current.Shutdown();
}
}
}
}
You can put any kind of behavior in DependencyProperty, which is available only through the code and call it a XAML:
<DataTrigger Binding="{Binding ElementName=SomeControl, Path=Tag}" Value="Shutdown">
<Setter Property="local:ProgramBehaviours.Shutdown" Value="True" />
</DataTrigger>
Also, you can access it directly through the code of behavior:
ProgramBehaviours.SetShutdown(SomeControl, Value);
Or from XAML without condition:
<SomeControl local:ProgramBehaviours.SetShutdown="True" ... />