private void UpdateListPhong()
        {
            PhongData data = new PhongData();
            listView.Items.Clear();
            foreach (DataRow dr in data.LayMaPhong().Rows)
            {
                PhongInFo phongInFo = new PhongInFo();
                phongInFo.MaPhong = (string)dr.ItemArray[0];
                phongInFo.MaLoaiPhong = (string)dr.ItemArray[1];
                phongInFo.MaTinhTrangPhong = (string)dr.ItemArray[2];

                ListViewItem item = new ListViewItem(phongInFo.TenPhong);

                if (phongInFo.MaTinhTrangPhong == "TTP1")
                {
                    item.ImageIndex = 0;
                }
                else if (phongInFo.MaTinhTrangPhong == "TTP2")
                {
                    item.ImageIndex = 1;
                }
                else if (phongInFo.MaTinhTrangPhong == "TTP3")
                {
                    item.ImageIndex = 2;
                }
                else
                {
                    item.ImageIndex = 3;
                }

                listView.Items.Add(item);
            }
        }
        private void cậpNhậtToolStripMenuItem_Click(object sender, EventArgs e)
        {
            PhongData data = new PhongData();
            listView.Items.Clear();
            foreach (DataRow dr in data.LayMaPhong().Rows)
            {
                PhongInFo phongInFo = new PhongInFo();
                phongInFo.MaLoaiPhong = (string)dr.ItemArray[1];
                phongInFo.MaPhong = (string)dr.ItemArray[0];
                phongInFo.MaTinhTrangPhong = (string)dr.ItemArray[2];
                ListViewItem item = new ListViewItem(phongInFo.MaPhong);

                if (phongInFo.MaTinhTrangPhong == "TTP01")
                {
                    item.ImageIndex = 0;
                }
                else if (phongInFo.MaTinhTrangPhong == "TTP02")
                {
                    item.ImageIndex = 1;
                }
                else if (phongInFo.MaTinhTrangPhong == "TTP03")
                {
                    item.ImageIndex = 2;
                }
                else
                {
                    item.ImageIndex = 3;
                }

                listView.Items.Add(item);
            }
        }