private async void DeleteButton_Clicked(object sender, EventArgs e)
{
var result = await noteManager.DeleteAsync(note);
if (result)
{
DependencyService.Get <IMessage>().ShortAlert("Note deleted.");
}
else
{
DependencyService.Get <IMessage>().ShortAlert("Note can not be deleted.");
}
Application.Current.MainPage = new NoteListPage();
}