<td  align="left">
                                    
                                            <ext:FileUploadField 
                                                Width="300"
                                                ID="FileUploadField" 
                                                runat="server" 
                                                EmptyText="请选择文件"
                                                FieldLabel="&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;广告图片"
                                                Icon="ImageAdd"
                                                ButtonText="浏览"
                                                BlankText="文件路径不能为空"
                                                AllowBlank="false"
                                                Regex="^.+\.((jpg)|(jpeg)|(gif))$"
                                                RegexText="文件格式不正确，建议后缀名(jpg)|(jpeg)|(gif)">
                                                <Listeners>
                                                    <FileSelected Handler="test(this)" />
                                                </Listeners>
                                              
                                            </ext:FileUploadField>
                                         
                               </td>
 
[/code]