change MessageDialog content or show new one from MessageDialog handler Windows Store app

Question

I have MessageDialog dialogue responsible for delete confirmation.

private async void ShowDialogClick(object sender, RoutedEventArgs e)
{
    MessageDialog md = new MessageDialog("Are your sure you want to delete this?");

    md.Commands.Add(new UICommand("Delete",
        new UICommandInvokedHandler(DeleteItemHandler)));
    md.Commands.Add(new UICommand("Cancel"));

    await md.ShowAsync();
}

When user clicks Delete, DeleteItemHandler invokes operation on database, but how can I inform user about unsuccessful operation?

I tried to create new MessageDialog, but I got win32 exception.

private async void DeleteItemHandler(IUICommand command)
{
    MessageDialog md = new MessageDialog("New content");

    String result = DbDeletation();

    if(result != "OK")
        await md.ShowAsync();
}

What is the best way to inform user about error?

Answer 1

According to Windows Store App guidelines MessagegDialog isn't good way to confirm delete.

When the app needs to confirm the user's intention for an action that the user has taken, a flyout is the appropriate surface. See Guidelines for flyouts.

Now I've cleaner code...

    private async void DeleteItem_Click(object sender, RoutedEventArgs e)
    {
        MessageDialog md = new MessageDialog("Error");

        String result = DbDeletation();

        if (result != "OK")
            await md.ShowAsync();
    }

And more gently solution :)

    <Button HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Content="Show Dialog">
        <Button.Flyout>
            <Flyout>
                <StackPanel>
                    <TextBlock>Are your sure you want to delte this?</TextBlock>
                    <Button Click="DeleteItem_Click"
                            Content="Delete"
                            HorizontalAlignment="Right"/>
                </StackPanel>
            </Flyout>
        </Button.Flyout>
    </Button>