If Condition in Design Page

<% if(Request.QueryString["id"]==null){ %>
                         <tr class="row1">
                                            <td align="left" style="width: 125px">
                                                <strong>
                                                &nbsp;Upload File</strong></td>
                                            <td align="left" colspan="2" style="width: 672px">
                                                &nbsp;<asp:FileUpload ID="txtFileUpload" runat="server" CssClass="swifttext" />
                                                </td>
                                        </tr>
                                        <%} else{%>
                                        <tr class="row1">
                                            <td align="left" style="width: 125px">
                                                <strong>
                                                &nbsp;Upload File</strong></td>
                                            <td align="left" colspan="2" style="width: 672px">
                                                <table cellpadding="0" cellspacing="0" border="0">
                                                    <tr>
                                                        <td><asp:HyperLink ID="FileList" runat="server" Target="_blank"><img src="../../Images/menu_pdf.gif" /></asp:HyperLink>
                                                        </td>
                                                        <td>
                                                            &nbsp;<asp:HyperLink ID="RemoveImg" runat="server"><img src="../../Images/del.gif" /></asp:HyperLink>
                                                            &nbsp;<asp:FileUpload ID="txtEFileUpload" Visible="false" runat="server" CssClass="swifttext" />
                                                        </td>
                                                    </tr>
                                                </table>
                                            </td>
                                        </tr>
                                        <%} %>