How to use file upload from a partial page in asp.net mvc3

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C#

.NET

MVC3

I have a partial view page,in which i have markup for file upload.I have a razor view as below inside my partial view page

@using (Html.BeginForm("Upload", "Provider", FormMethod.Post, new { id = "form", enctype = "multipart/form-data" }))
{


}

My controller method goes as

[HttpPost]
        public ActionResult Upload(HttpPostedFileBase file)
        {
            // extract only the fielname
            var fileName = Path.GetFileName(file.FileName);
            // store the file inside ~/images/User-Image folder
            var path = Path.Combine(Server.MapPath("~/images/"), fileName);
            // this is the string you have to save in your DB
            string filepathToSave = "images/" + fileName;
            file.SaveAs(path);
            //--------------------------------------------

            // Code to save file in DB by passing the file path

            //----------------------------------------------
            return View();
        }

I always get a null value in variable "file" of controller method.I did a little bit research over this.Concluded that, in normal way if we are using file upload from a normal view instead of partial view it work's fine.But file upload work unexpectedly from a partial view page.It hits controller method as usual,but every time i get null value in variable "file" as i have mentioned earlier.I searched over google to get a solution of this issue.But failed.Please help me out.