problem when download into .xls

HI ALL,

I have written one prog and this prog is downloading in to .xls and also sending a mail to the user. here the problem is when downloading in to the.xls the bank account no is downloaded as exponential form but i need to get this in normal display number can any one suggest me how to solve this issue.

example :

The bank account no is downloading like this

6.0143E+11

but i want to download it in this form

601430387016.

Thanks in advance for your help.

sankar.