asp.net mvc input file

Hi guys,

I'm trying to do something really simple that I did before and for some reason its not working.
I'm trying to upload image through html and save it, but when I upload it from the view and get it in the controller it shows NULL anytime.
Here is how it works:
I initiate Index page then I have this html inside my Index page:

<h2>Basic File Upload</h2>
@using (Html.BeginForm("FileUpload", "Uploadpictures", FormMethod.Post))
{
    <div class="row">
        <div class="col-sm-4 form-group">
            <input type="file" name="uploadFile" id="upload" />
            <input type="submit" name="submit" value="Upload Image" />
        </div>
    </div>
    <br><br>
    @ViewBag.Message
}

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After I click submit I send the file to the controller:
My controller:

public ActionResult FileUpload(HttpPostedFileBase uploadFile)
        {
            if (uploadFile != null && uploadFile.ContentLength > 0)
                try
                {
                    string path = Path.Combine(Server.MapPath("~/Images"),
                                               Path.GetFileName(uploadFile.FileName));
                    uploadFile.SaveAs(path);
                    ViewBag.Message = "File uploaded successfully";
                }
                catch (Exception ex)
                {
                    ViewBag.Message = "ERROR:" + ex.Message.ToString();
                }
            else
            {
                ViewBag.Message = "You have not specified a file.";
            }
            return RedirectToAction("Index", "Uploadpictures");
        }

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Issue: the controller get the value NULL - what am I doing wrong here as I can't see anything wrong.

Thanks,