private void OnOpenPDF(object sender, EventArgs e)
        {
            CutlistData cd = new CutlistData();

            object[] o        = cd.GetDrawingData(part);
            string   fullpath = string.Format(@"{0}\{1}", o[2], o[1]);

            if (o[1].ToString() == @"NULL")
            {
                o        = cd.GetMetalDrawingData(part);
                fullpath = string.Format(@"{0}\{1}", o[2], o[1]);
            }

            if (o[1] != @"NULL")
            {
                System.Diagnostics.Process.Start(fullpath);
            }
        }