private void btnPrint_Click(object sender, EventArgs e)
        {
            string message = null;
            int    result  = printLabelsBll.PrintLabel(this.txtCode.Text.Trim(), ref message);

            if (result == 0)
            {
                MessageBox.Show(@"打印失败!", @"提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            if (message != null)
            {
                MessageBox.Show(message, @"提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }
 public int PrintLabels(string code, ref string message)
 {
     return(printLabelsBll.PrintLabel(code, ref message));
 }