hi 
I used below code for popup window:
 
 
 
        <asp:UpdatePanel ID="Upbdt2" runat="server">
                                            <ContentTemplate>
                                                <asp:ModalPopupExtender DropShadow="true" ID="ModalPopupExtender2" PopupControlID="PnPopup2"
                                                    runat="server" TargetControlID="BtnPopup2">
                                                </asp:ModalPopupExtender>
                                                <asp:Button ID="BtnPopup2" OnClick="BtnPopup2_Click" runat="server" Text="انتخاب تصویر"
                                                    CssClass="DPC9_Img1" BorderStyle="Solid" BorderWidth="0px" BorderColor="White"
                                                    CausesValidation="false" />
                                                <asp:Panel ID="PnPopup2" runat="server" BackColor="White" CssClass="panel" style = "display:none">
                                                    <div class="CloseImge" style = "display:none">
                                                        <asp:ImageButton ID="ImageButton4" runat="server" ImageUrl="~/image/close.png" CausesValidation="false"
                                                            CssClass="closeI" />
                                                    </div>
                                                    <div class="CloseImge">
                                                        <asp:FileUpload ID="fup3" runat="server" ToolTip="برای بار گذاری عکس کلیک نمایید."
                                                            CssClass="fup" />
                                                    </div>
                                                    <div class="CloseImge">
                                                        <asp:Label runat="server" ID="lbl3" CssClass="lblup"> لطفاً برای بارگذاری عکس روی دکمه بالا کلیک کنید.</asp:Label>
                                                    </div>
                                                    <div class="CloseImge1">
                                                        <asp:ImageButton ID="BtnUpload2" OnClick="BtnUpload2_Click" runat="server" CausesValidation="false"
                                                            ImageUrl="~/image/load.png" CssClass="load" />
                                                    </div>
                                                </asp:Panel>
                                            </ContentTemplate>
                                            <Triggers>
                                                <asp:PostBackTrigger ControlID="BtnUpload2" />
                                            </Triggers>
                                        </asp:UpdatePanel>
is there other code that I can replace with above code?
Best Regards
Neda