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        /// <summary>
        /// Apre una folder e seleziona un file passato da  "path_to_invoice"
        /// </summary>
        /// <param name="path_to_invoice"></param>
        public static void mostra_pdf_invoice(string path_to_invoice)
        {  
            string filePath = path_to_invoice;
            if (!File.Exists(filePath))
            {
                MessageBox.Show("You must first Generate an Invoice");
                return;
            }

            // combine the arguments together
            // it doesn't matter if there is a space after ','
            string argument = "/select, \"" + filePath + "\"";

            System.Diagnostics.Process.Start("explorer.exe", argument);
        }