Select all in ListBox by clicking a Button

Question

I would like to highlight all content of a ListBox by a press of a button, but it doesn't work.

  private void selectAll_Click(object sender, RoutedEventArgs e)
  {
       resultbox.Select();
  }

I also wanted to have a "label" to count how many rows has the same ListBox. What should I do?

Answer 1

You can use on button click:

 for (int i = 0; i < myListBox.Items.Count;i++)
 {
      myListBox.SetSelected(i, true);
 }