Ajax表单帖子正在重定向如何避免它

Question

我所做的是用于文件上传的ajax表单帖子，但它似乎是重定向整个表单.Below是控制器操作方法和部分视图。

 public JsonResult FileUpload()
 {
 string message = "File is empty or null";
 JsonResult jsonResult=null;
 foreach (string upload in Request.Files)
 {
 if (!Request.Files[upload].HasFile()) continue;
 string path = AppDomain.CurrentDomain.BaseDirectory + "/Attachment/Audit/";
 string filename = Path.GetFileName(Request.Files[upload].FileName);
 Request.Files[upload].SaveAs(Path.Combine(path, filename));
 message = "File Uploaded Successfully";
 }

 jsonResult = Json(message, JsonRequestBehavior.AllowGet);

 return jsonResult; 
 }

---

部分视图

@using XXXX.Models
@using XXXX.ViewModels
@using XXXX.UtilityModels
@model AuditModel

<div id="pvView" class="view">


 <div id="tabStripBottom" data-role="tabStripBottom" class="tabStripBottom k-state-  active">

.
.
.
.


 <div>

 @using (Html.BeginForm("FileUpload", "Audit", FormMethod.Post, new { enctype = "multipart/form-data", id = "ajaxUploadForm" }))
 {
 <input type="file" name="FileUpload1" /><br />
 <input type="submit" name="Submit" id="Submit" value="Upload" />
 }
 </div>
 <span>
 <label id="lblMessg"></label>
 </span>

 </div>

 <input type="button" value="Save" onclick="onSave" />

 </div>
 <script>

 $(function () {
 $("#ajaxUploadForm").ajaxForm({
 iframe: true,
 type: 'POST',
 dataType: "json",
 cache: false,
 timeout: 1200000,
 async: true,
 beforeSubmit: function () {

 },
 success: function (result) {
 debugger;
 $("#lblMessg").html() = result.message;
 alert("sucess");
 },
 error: function (xhr, textStatus, errorThrown) {
 alert("Error uploading file");
 }
 });
 });

 .
 .
 .
 .

 </script>

任何人都可以帮助我吗？ 提前致谢