Unable to call action from view int his way in asp.net mvc

I am developing the image upload module for my asp.net mvc application. for that I write code partially in my view page as

//Other html code...
 <div id="popuup_div" class="popup_msg">
  <form action="/UserProfile/uploadfile" method="post" enctype="multipart/form-data">
    <%= Html.Hidden("userIdForFile",Model.UserId) %>
   <p>
     <label for="ProfilePhoto"><%= Resources.Global.ProfilePhoto %>:</label>
     <input type="file" name="pPhoto"  />
   </p>
   <input type="submit" value="upload" /> |<input type="button" value="close" onclick="javascript:$('#popuup_div').hide();" />    
  </form>
</div>

//Other html code...

But unable to call the action after code get published . why should be this . can somebody help me ?

Edited:

     <% using (Html.BeginForm("uploadfile", "UserProfile", FormMethod.Post, new { id = "testform", enctype = "multipart/form-data" }))
             {%>
            <%= Html.Hidden("userIdForFile", Model.UserId)%>
           <p>
             <label for="ProfilePhoto"><%= Resources.Global.ProfilePhoto%>:</label>
        开发者_开发技巧     <input type="file" name="pPhoto"  />
           </p>
           <input type="submit" value="upload" /> |<input type="button" value="close" onclick="javascript:$('#popuup_div').hide();" />    
 <% } %>


    **Edited**

In firebug i got this text of my HTML with light colored :

I suspect that when you publish the site there is a virtual directory involved. So /UserProfile/uploadfile is no longer a correct url. To avoid this you should never hardcode your urls like this. I would recommend you using HTML helpers.

So:

<% using (Html.BeginForm("uploadfile", "UserProfile", null, FormMethod.Post, new { enctype = "multipart/form-data" })) { %>
    ...
<% } %>