Why Give Me Null When I Submit My Form (Upload Image)

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ASP.NET

MVC

C#5.0

hello
i want to upload my picture to my host and save url'picture to database

in my table on database i have this fileds:
id
title
imageurl

and i write this code for action:

[HttpGet]
       public ActionResult Create()
       {
           return View();
       }
       [HttpPost]
       public ActionResult Create(HttpPostedFileBase ImageFile, TNew tnew)
       {
           if(ImageFile!=null && ImageFile.ContentLength>0)
           {
               var file = Path.GetFileName(ImageFile.FileName);
               var pathfile = Path.Combine(Server.MapPath("~/Photo"), file);
               ImageFile.SaveAs(pathfile);
               tnew.imageurl = pathfile;
               _db.TNews.Add(tnew);
               _db.SaveChanges();
           }

           return View();
       }

and this for create page:

@using (Html.BeginForm("Create", "HOME", FormMethod.Post, new {enctype="mulipart/form-data" }))
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>TNew</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.title)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.title)
            @Html.ValidationMessageFor(model => model.title)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.imageurl)
        </div>
        <div class="editor-field">
            <input type="file" name="ImageFile" />
        </div>

        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>
}

but when i submit my form image file is null
how can i solve this?