private void btnPreview_Click(object sender, EventArgs e)
{
LabelPrinter printer = new LabelPrinter();
LabelDesign design = new LabelDesign();
this.DesignLabel(design);
printer.Preview(design, LabelConst.CLS_PRT_RES_203, LabelConst.CLS_UNIT_INCH, 450, 600);
}
