private void btnCreate_Click(object sender, EventArgs e)
        {
            Homestay fr = new Homestay();

            fr.ShowDialog();
            room((int)cbxHomestayown.SelectedValue);
            ShowList();
        }
 private void btnUpdate_Click(object sender, EventArgs e)
 {
     if (grdListview.SelectedRows.Count == 1)
     {
         var      row  = grdListview.SelectedRows[0];
         var      cell = row.Cells["ID"];
         int      ID   = (int)cell.Value;
         Homestay edit = new Homestay(ID);
         edit.ShowDialog();
         room((int)cbxHomestayown.SelectedValue);
         ShowList();
     }
 }