private void btnInvoicePDF_Click(object sender, EventArgs e)
        {
            create_folders();
            string folder = @"\\designsvr1\dropbox\Projects\" + _ID + "_" + _title + @"\Invoiced";//open PDF form and pass over the correct folder
            frmPDF pdf    = new frmPDF(folder);

            pdf.ShowDialog();
        }
        private void btn_PDF_Click(object sender, EventArgs e)
        {
            create_folders();
            string folder = @"\\designsvr1\dropbox\Projects\" + _title + @"\" + _ID + @"_tender";
            frmPDF pdf    = new frmPDF(folder);

            pdf.ShowDialog();
        }