急求大佬解决C#winform中listview问题

Question

代码如下
private void button4_Click(object sender, EventArgs e)
{
if (listView1.SelectedItems.Count > 0)
{
listView1.Items.RemoveAt(listView1.SelectedItems[0].Index);
textBox3.Text = (int.Parse(textBox3.Text) - 1).ToString();
int i = Convert.ToInt32(listView1.SelectedItems[0].SubItems[2].Text);
//textBox4.Text =
}
}

            调试的时候也能取到值，但是执行完就报错下标不对，求大佬帮帮忙![图片说明](https://img-ask.csdn.net/upload/201707/07/1499394981_637274.png)![图片说明](https://img-ask.csdn.net/upload/201707/07/1499394991_821269.png)![图片说明](https://img-ask.csdn.net/upload/201707/07/1499395002_852633.png)

Answer 1