ช่วยแก้ปัญหาหน่อยคะ ตรง listbox ไม่เข้าใจอ่ะคะ vb.net

Public Class Form2

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim _ListItem As ListViewItem
        _ListItem = New ListViewItem({ListView1.Items.Count + 1, ""})
        ListView1.Items.Add(_ListItem)
        If ListView1.Items.Count > 1 Then
            ListView1.Items(ListView1.Items.Count - 2).SubItems(1).Text = ListView1.Items.Count
        End If
    End Sub
End Class