Read only Fileupload

 

Hai, I've one doubt, I want to make my text box portion in File upload to read only. I used the following method.But its not working. Can you tell me how can I resolve this/ 
<asp:FileUpload ID="FileUpload1" runat="server" Style="left: 112px; position: absolute;
top: 113px" Width="36%"< ...