I\'m trying to get the simplest possible example of a Listview with subitems working. But this code:
private void button1_Click(object sender, EventArgs e) {
You need to add another column for the SubItem. The reason why your subitem is not shown is because there is no column for it. Try this one.
listView1.Columns.Add("Column 1"); // you can change the column name
listView1.Columns.Add("Column 2");
string[] strArr = new string[4] { "uno", "dos", "twa", "quad" };
foreach (string x in strArr)
{
ListViewItem lvi = listView1.Items.Add(x);
lvi.SubItems.Add("Ciao, Baby!");
}