asp wizard control- not retaining value of file upload control

Hi,

I am developing a web application in asp.net and c#. I'm using an asp wizard control. there is  6 wizard steps in my wizard. In each phase im using many controls, so that many postback is done during execution.

I am using a asp fileupload control in second wizard step. My problem is that the value selected using fileupload control is not getting when i click wizard finsh button in the final step. values acquired using all other controls are available there.

Hope someone help me.

I just want to get the selected filename in last step. 

Thanks in advance