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 had the same problem but I found why.

I had an "ItemChecked" event handler attached to my listView that was doing some heavy stuff.

I removed the eventHandler and it solved my problem. Try removing any "ItemChecked" eventhandler and see if the speed is better.