private void addButton_Click(object sender, EventArgs e)
{
    string item1Str = coutNumber.ToString();//第一列文本
    string item2Str = coutNumber.ToString();//第二列文本
    this.listView1.Items.Add(new ListViewItem(new string[] { item1Str, item2Str }));//添加一行
    coutNumber++;//listView的行數(shù)遞增
}
 
private void delButton_Click(object sender, EventArgs e)
{
    foreach (ListViewItem item in listView1.Items)
    {
        if (listView1.SelectedItems.Contains(item))
        {
            int indexDel = listView1.Items.IndexOf(listView1.FocusedItem);
            if (listView1.SelectedItems.Count != 0)
            {
               listView1.Items.RemoveAt(indexDel);//刪除
            }
        }
    }
}