MVC always returns null when I save an image

Hi, I am developing an application in MVC and I want to save an image in a table called Inventory in my database but it always tells me that it can not return null

Here is my code

My model

public partial class Inventario
    {
        public int IdProducto { get; set; }
        [DisplayName("Producto")]
        public string Nom_Producto { get; set; }
        [DisplayName("Precio por unidad")]
        public Nullable<decimal> Precio_Uni { get; set; }
        public Nullable<int> Cantidad { get; set; }
        [DisplayName("Categoria")]
        public Nullable<int> IdCategoria { get; set; }
        [DisplayName("Cargar Imagen")]
        public string ImagePath { get; set; }


        public HttpPostedFileBase ImageFile { get; set; }
    }

My sight

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

<input type="file" name="ImageFile" required>

My controller

[HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "IdProducto,Nom_Producto,Precio_Uni,Cantidad,IdCategoria,ImagePath")] Inventario inventario)
        {
            string fileName = Path.GetFileNameWithoutExtension(inventario.ImageFile.FileName);
            string extension = Path.GetExtension(inventario.ImageFile.FileName);
            fileName = fileName + DateTime.Now.ToString("yymmssfff") + extension;
            inventario.ImagePath = "~/Image/" + fileName;
            fileName = Path.Combine(Server.MapPath("~/Image/"), fileName);
            inventario.ImageFile.SaveAs(fileName);

            if (ModelState.IsValid)
            {
                db.Inventarios.Add(inventario);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(inventario);
        }