Unable to display Modal popup by clicking button inside a datagrid

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C#

ASP.NET

There is a Datagrid which binds images with their ID; while click on edit button i have disabled the image and enable a button. Now for that button click i want to show a ajax modalpopup where i want to bind file uploader control. Now the popup displays properly but after selecting image while submit the popup Ok button there is no file in the uploader control which i was selected.


Here is my code snippet

<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="dgnews" />
    </Triggers>
    <ContentTemplate>
    <asp:DataGrid ID="dgnews" runat="server" AutoGenerateColumns="false" 
                    oncancelcommand="dgnews_cancel" ondeletecommand="dgnews_delete" 
                    oneditcommand="dgnews_edit" onpageindexchanged="dgnews_PageIndexChanged" 
                    onupdatecommand="dgnews_update" Width="715px" AllowPaging="true" 
            AllowSorting="true" DataKeyField="res_id"  PageSize="10" 
            onitemdatabound="dgnews_ItemDataBound" >
                    <PagerStyle HorizontalAlign="Center" Mode="NumericPages" 
                         Position="TopAndBottom"/>
                    <columns>
                    <asp:BoundColumn DataField="res_id" Visible="false" HeaderText=""></asp:BoundColumn>
                            <asp:TemplateColumn HeaderText="Image">
                                <ItemTemplate>
                                    <ul style="padding-removed15px;">
                                       <a href="#"><img id="imgSmall" src='<%# DataBinder.Eval(Container, "DataItem.res_image") %>' alt="Gallery Image" width="50" height="50" /></a>
                                    </ul>                                            
                                </ItemTemplate>
                                <EditItemTemplate>
                                    <asp:Button ID="aaa" Text="Select Images" runat="server"/>
                                        <cc1:ModalPopupExtender BackgroundCssClass="modalBackground"
    CancelControlID="Button2"  runat="server" PopupControlID="picuploader" ID="ModalPopupExtender1"
    TargetControlID="aaa" />
    <asp:Panel ID="picuploader" runat="server" CssClass="modalPopup" DefaultButton="Button1" Style="display:none;">
    <asp:UpdatePanel ID="UpdatePanel2" runat="server">
    <Triggers>
    <asp:AsyncPostBackTrigger ControlID="Button1" />
    </Triggers>
    <ContentTemplate>
            <table>
            <tr>
                <td>
                    <asp:Image Width="50px" Height="50px" ID="Image1" runat="server" /></td>
                <td>
                    <asp:FileUpload ID="FileUpload1"  runat="server" /></td>
            </tr>
            <tr>
                <td>
                    <asp:Image Width="50px" Height="50px" ID="Image2" runat="server" /></td>
                <td>
                <asp:FileUpload ID="FileUpload2"   runat="server" /></td>
            </tr>
            <tr>
                <td>
                    <asp:Image ID="Image3" runat="server" Width="50px" Height="50px" /></td>
                <td>
                <asp:FileUpload ID="FileUpload3"   runat="server" /></td>
            </tr>
            <tr>
                <td>
                    <asp:Image ID="Image4" runat="server" Width="50px" Height="50px"/></td>
                <td>
                <asp:FileUpload ID="FileUpload4"  runat="server" /></td>
            </tr>
            <tr>
                <td></td>
                <td><asp:Button ID="Button1" runat="server" Text="ok" OnClick="UploadPic" />
                    <asp:Button ID="Button2" runat="server" Text="cancel" /></td>
            </tr>
            </table>
            </ContentTemplate>
            </asp:UpdatePanel>
        </asp:Panel>
                                </EditItemTemplate>
                            </asp:TemplateColumn >
                           
                <asp:EditCommandColumn CancelText="Cancel" EditText="Edit" HeaderText="Modify" UpdateText="Update"/>
                            <asp:ButtonColumn CommandName="Delete" Text="Delete" HeaderText="Remove"/>                                           
                </columns>
                    </asp:DataGrid>
    </ContentTemplate>
    </asp:UpdatePanel>