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

this is absolutely not nice but much faster than a loop if you have many many (100+) items: Select the Listbox and simulate key input of [home] and [shift]+[end]

lb.BeginUpdate();
lb.Select();
SendKeys.Send("{Home}");
SendKeys.Send("+{End}");
lb.EndUpdate();

EDIT: works with SelectionMode.MultiExtended only I guess

DoubleEDit: also be aware that this might be too slow for code being performed with lb.selecteditems afterwards, but it may be useful for an [Select All] button that the user will click.