using System;
public class Program
{
public static void Main()
// Hif_barcode_no.Value = DateTime.Now.ToString("yyyyMMddHHmmss");
Hif_barcode_no.Value = DateTime.Now.ToString("yyyyMM")
+ Hif_contract_pk.Value.ToString().PadLeft(3, "0")
+ Lb_Stock_no.Text.ToString().PadLeft(3, "0");
}