How to keep file in asyncupload during post back

Hello,

I have a user registration web form page where users have to enter specific fields. 

I go through and fill out the info but when I leave a required field blank I have a server side error check.  When it does the error check I lose the document within my radAsyncUpload control.    The file is already saved in the App_Data till I save it when the post is error free.

Can the control hold the file information till an error free post back is made?

I don't want my users to have to select their file multiple times.

Thank you,

Jerry