Try code such as:
ListViewItem item = new ListViewItem('NewItem');
item.SubItems.AddRange(new string[]{'SubItem1', 'SubItem2')};
listView1.Items.Add(item);
listView1.Items.Add(new ListViewItem(new string[]{'item1', 'item2', 'item3', 'item4'});
listView1.View = View.Details;
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