Populate data into FileUpload button during runtime

Question

How can I retrieve data into FileUpload button during runtime (without browsing).

 

Ex:

Text box: We should enter date in that textbox.

 

For Suppose if the entered date is already in the database then the corresponding filename for that particular date should be displayed in the "FileUpload" button.

If the entered date is not there in the database then we can add the file into FileUpload using "Browse" button.

 

Can you pl. help on this.I am searching the solution for this but I am not getting.