Leading zeros getting truncated from a number field while after converting AX report to excel through code

Hi,

I have an AX report which i generate through code and save it as a document in excel format. But when i open that document leading zeros in that document gets truncated. For example i have a column named item number, item number = 000034, but when i open the excel it shows only 34. Four leading zeroes are truncated. Is there a way to handle this through code so that when i open the excel zeros are not truncated. 

Thanks in advance.