选择并编辑列表视图

Question

如何使用文本框或弹出窗口或新表单在C＃程序的列表视图中选择和编辑子项目？请查看我的样本，谢谢，如何编辑整行。

try
{
    if (listView1.Items.Count == 0)
    {
        MessageBox.Show("Empty items", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
    else
    {
        int itmCnt = 0;
        int i = 0;
        int t = 0;

        listView1.FocusedItem.Remove();
        itmCnt = listView1.Items.Count;
        t = 1;
        for (i = 1; i <= itmCnt + 1; i++)
        {
            t = t + 1;
        }
        txtTotal.Text = subtot().ToString();
        //undefined pa!!!!!!!!!!!
        int val1 = 0;
        int val2 = 0;
        int.TryParse(txtTotal.Text, out val1);
        int.TryParse(txtPayment.Text, out val2);
        int I = (val2 - val1);
        txtChange.Text = I.ToString();
    }
    btnRemove.Enabled = false;
    if (listView1.Items.Count == 0)
    {
        txtTotal.Text = "";
    }
}

不是删除，而是阅读或编辑，请帮助