怎么在input file标签里面输入值了就不能跳转页面

mvc3模式下的    这是js跳转代码
<script language="javascript" type="text/javascript">    $(window).ready(function () {        $('.btnSave').bind('click', function () {
           
            $('form').submit();
               });
    });
</script>下面是html代码  <td width="8%" align="center" valign="middle" class="sy9">
                        <a href="#" class="lk3 btnSave">保存</a>
      </td>  @using (Html.BeginForm("Create", "Article", FormMethod.Post, new { enctype = "multipart/form-data" }))
                                                                                        {         
                                                                                            @Html.ValidationSummary(true)<tr>
                                                                                                <th bgcolor="#d7eaee" height="40" width="14%" align="right">
                                                                                                    <span class="style8">附件：</span>
                                                                                                </th>
                                                                                                <td bgcolor="#ffffff" align="left">
                                                                                                    <input class="select_search06" name="AttachmentFile" id="AttachmentFile" type="file" style="width: 300px; margin-left: 10px;" value=""  />
                                                                                                </td>
                                                                                            </tr>
}怎么在input file标签里面输入值了就不能跳转到后台的View中 不输入值就能跳转啊