Check all item in listview with huge list item?

Question

I want to check about 3000 item in listview. This is a bit of code :

foreach (ListViewItem item in this.lvItem.Items)
{
    item.Checked = !item.Ch         


        

Answer 1

I also don't think it's wise to expect a user to click 3000 items. But something I did recently, when adding the items, knowing that there would never be many and by default they should be checked, is check the items before adding them to the list.

Something like this:

foreach (Recipient recipient in recipients)
{
    var item = new ListViewItem(recipient.FirstName + " " + recipient.LastName);
    item.Tag = recipient;
    item.Checked = true;
    lvRicipients.Items.Add(item);
}