private void button1_Click(object sender, EventArgs e)
        {
            string wName = comboBox1.Text;
            string wNo   = (string)hs[wName];

            if (wNo == null)
            {
                MessageBox.Show("请选择仓库地址");
                return;
            }
            int v = 0;

            Productctrl.loadProduct("", wNo, "", listView2, ref v);
            Productctrl.loadunproduct(wNo, listView1);
            label6.Text = v.ToString();
        }