سوال: اجرای کد آپلود فایل از طریق جی کوئری و پیامی که دیده نمیشه

<script>
 $(document).ready(function () {
 $("#doc_up_btn").click(function (evt) {
 var fileUpload = $("#Mtfk_up").get(0);
 var files = fileUpload.files;
 var data = new FormData();
 for (var i = 0; i < files.length; i++) {
 data.append(files[i].name, files[i]);
 }
 $.ajax({
 url: "FileUploadHandler.ashx",
 type: "POST",
 data: data,
 contentType: false,
 processData: false,
 success: function (result) { aler(result); },
 error: function (err) {
 alert(err.statusText);
 }
 });
 evt.preventDefault();
 });
 });
 </script>

<%@ WebHandler Language="C#" Class="Handler" %>


using System;
using System.Web;


public class Handler : IHttpHandler {
 
 public void ProcessRequest (HttpContext context) {
 if(context.Request.Files.Count > 0)
 {
 HttpFileCollection files = context.Request.Files;
 for(int i = 0; i<files.Count; i++)
 {
 HttpPostedFile file = files[i];
 string fname = context.Server.MapPath("~/docs/" + file.FileName);
 file.SaveAs(fname);
 }
 }
 //------------------------------------------//
 context.Response.ContentType = "text/plain";
 context.Response.Write("File uploaded successfully!");
 }
 
 public bool IsReusable {
 get {
 return false;
 }
 }


}