Problem in upload file

[sysuser1]

Hi everyone,

I want to do a module where I can upload a file.
There is a part of my form :

<input type=\"file\" name=\"image\" value=\"\"/>

and when I call my method to recover the data :

UploadedFile image = page.getParameterAsFile("image");

the problem is that the object "image" is null.
And I don't understand why??

Someone can help me??
Thanks !