public static string GetInvoiceNo(int nos)
        {  //C33 IN 500001
            InvoiceNo inv = new InvoiceNo
            {
                TP = nos
            };

            return(inv.ToString());
        }
        public static string GetInvoiceNo(int old, int newno)
        {  //C33 IN 500001
            InvoiceNo inv = new InvoiceNo
            {
                TP = newno
            };

            return(inv.ToString());
        }