How do I select all items in a listbox on checkbox checked?

Question

I need to select all items in a ListBox when a CheckBox is clicked. Is it possible to select all items in the ListBox using a single line of code? Or will I have to loop thr

Answer 1

I use Mika's solution, however this can be very slow if you have thousands of items. For a massive speed increase you can turn off visibility briefly. The listbox will not actually disappear during the operation as you might suspect, but the selection occurs at least 10x faster in my case.

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