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

You need to call BeginUpdate before the loop and EndUpdate after the loop:

listView1.BeginUpdate();
foreach (ListViewItem item in listView1.Items)
    item.Checked = true;
listView1.EndUpdate();

Calling BeginUpdate prevents the control from drawing until the EndUpdate method is called.