MVC3 uploadify Jquery plugin error HTTP 404 and IO error
===

I am using Uploadify v3.1 for MVC3 C#.

My cshtml code is

    <div class="container_24">
        <input type="file" name="file_upload" id="file_upload" />
    </div>

My js code is

    $(document).ready(function () {
        $('#file_upload').uploadify({
            'method': 'post',
            'swf': '../../Scripts/uploadify-v3.1/uploadify.swf',
            'uploader': 'DashBoard/UploadFile'
        });
    });

And the controller code is 

    [HttpPost]
            public ActionResult UploadFile(HttpPostedFileBase file)
            {
                // Verify that the user selected a file
                if (file != null && file.ContentLength > 0)
                {
                    // extract only the fielname
                    var fileName = Path.GetFileName(file.FileName);
                    // store the file inside ~/App_Data/uploads folder
                    var path = Path.Combine(Server.MapPath("~/Uploads"), fileName);
                    file.SaveAs(path);
                }
                // redirect back to the index action to show the form once again
                return RedirectToAction("Index", "Home");
            }

Now when i click the upload button it show two errors, sometime it **show IO error** and sometime it show HTTP 404 error for some file. what is wrong ? help me please ?