DataList1_ItemCommand not raised

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ASP.NET

Hi,

I am working on web application where I need to raise DataList1_ItemCommand event but it is not fired.
Please look into my code

HTML Code:-

<asp:DataList ID="DataList1" runat="server" Width="100%" CellPadding="0" RepeatDirection="Horizontal"
           RepeatColumns="1" OnItemDataBound="DataList1_ItemDataBound" HorizontalAlign="Center"
           OnItemCommand="DataList1_ItemCommand">
           <ItemTemplate>
               <div class="tubeblock">
                   <asp:HyperLink ID="Hyperlink1" runat="server">
                       <span><span>
                           <asp:Label ID="lblLikes" runat="server" Text='<%# Bind("Img_LikeMark") %>' SkinID="Lbl_listtxt"></asp:Label></span></span><table
                               cellspacing="0" cellpadding="0" width="100%" border="0">
                               <tbody>
                                   <tr>
                                       <td valign="top" width="97">
                                           <asp:ImageButton ID="ImageButton1" runat="server" SkinID="imgSmall" ImageUrl='<%# Bind("Image_Name","ThumbnailImages/{0}") %>'>
                                           </asp:ImageButton>
                                       </td>
                                       <td class="listtxt" valign="top">
                                           <asp:Label ID="lblimg_Title" SkinID="LBL_GalleryDisCription" runat="server" Text='<%# Bind("Image_Name") %>'></asp:Label><asp:Label
                                               ID="lblDis_bk" SkinID="LBL_GalleryDisCription" runat="server"></asp:Label><asp:Label
                                                   ID="lblDiscription" runat="server" Text='<%# Bind("Description") %>' Visible="False"></asp:Label><asp:Label
                                                       ID="lblGalleryID" runat="server" SkinID="LBL_INFO" Visible="False" Text='<%# Bind("Img_Id") %>'></asp:Label><asp:Label
                                                           ID="lblUrl" runat="server" Visible="False" Text='<%# Bind("Image_Name","ThumbnailImages/{0}") %>'></asp:Label><span></span>
                                       </td>
                                   </tr>
                               </tbody>
                           </table>
                   </asp:HyperLink>
               </div>
           </ItemTemplate>
       </asp:DataList>

C# Code

protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
   {
       Label lblGalleryID = (Label)(e.Item.FindControl("lblGalleryID"));
      // imgMain.ImageUrl = ((Label)(dl_Gallery.Items[0].FindControl("lblLargeUrl"))).Text.Trim().Replace("~/", "");
       Build_ImageGallery1();
   }

Here this item command not fired single time. I am not getting what's the reason.
please suggest me.

Same code is working on new one test page and this event is raised.

* Even page load event also not fired. while I click on datalist.

Thanks in advance!
Kuldeep Dwivedi