public static string IncrementSerialNo(string serialNo) //serialNo is a string with 6 digits
 {                                                       //Format 7 digit, then cut 6 right digit: This will reset a 0 when reach the limit of 6 digits
     return(CommonExpressions.IncrementSerialNo(serialNo, 1));
 }
 public static int GetEntryMonthID()
 {
     return(CommonExpressions.GetEntryMonthID(DateTime.Now));
 }