private async void DeleteAuthor_Clicked(object sender, EventArgs e)
{
var answer = await DisplayAlert("Question?", "Would you like to delete?", "Yes", "No");
if (answer)
{
Author author = (Author)listView.SelectedItem;
authorDataAccess.DeleteAuthorName(author.AuthorName);
}
Navigation.InsertPageBefore(new AllAuthorPage(), this);
await Navigation.PopAsync();
}