.Net Ajax Button problem

Hi everyone,

I'm developing .Net page and im using ajax controlled image control panel. I put a "OnClientClient" specification to button. However, when i put breakpoint to cs file it doesnt hit there and dont upload photo. My code :

<asp:ScriptManager ID="ScriptManager2" runat="server">
</asp:ScriptManager>
 <asp:UpdatePanel ID="UpdatePanel2" runat="server">
         <ContentTemplate>
<table width="0" border="0" cellspacing="3" cellpadding="0" style=" font-size:11px;">
  <tr>
    <td class="style2" align="center">
        <asp:Image ID="Image1" runat="server" />
    </td>
 </tr>
  <tr>
     <td class="style2">
        <br />
     </td>
 </tr>
 <tr>
     <td class="style2">
        <asp:FileUpload ID="FileUploadPhoto" runat="server" />
     </td>
 </tr>
  <tr>
     <td class="style2">
         <asp:Button ID="ButtonImageSave" runat="server" Text="Button" OnClientClick="ButtonImageSave_Click" />

     </td>
 </tr>
   <tr>
     <td class="style2">

         <asp:Label ID="LabelPhotoError" Text="" runat="server" />

     </td>
 </tr>
  </table>
  </ContentTemplate>
  </asp:UpdatePanel>

AND .CS is

  protected void ButtonImageSave_Click(object sender, EventArgs e) 
    {
        if (FileUploadPhoto.PostedFile != null)
        {

bla bla bla....

  }
        else
        {
            LabelPhotoError.Text = "";
        }
    }

*** I've one more ajax panel in page.I think updatepanels are crash.how can I solve this?