private void btn_delAppend_Click(object sender, EventArgs e)
        {
            string seletedItemString = listView_Appends.SelectedItems[0].SubItems[3].Text + "(" + listView_Appends.SelectedItems[0].SubItems[1].Text + ")";
            string opcode            = listView_Appends.SelectedItems[0].SubItems[2].Text;
            string msg = null;

            if (MessageBox.Show(
                    "您確定要取消遞補 [" + seletedItemString + "] 嗎",
                    "確認取消遞補",
                    MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
            {
                if (HttpCommunication.DeleteAppend(opcode, out msg))
                {
                    MessageBox.Show(msg, "取消遞補成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                else
                {
                    MessageBox.Show(msg, "取消遞補失敗", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
            }

            RefreshAppendList();
        }