<div class="form-group">
     @Html.LabelFor(model => model.Foto, htmlAttributes: new { @class = "control-label col-md-2" })
     <div class="col-md-10">
          <input type="file" name="ImageData" id="ImageData" />
     </div>
</div>

[HttpPost]
        public ActionResult MakaleOlustur(Makale m, HttpPostedFileBase file)
        {
            try
            {
                using (MvcBlogContext context = new MvcBlogContext())
                {
                    Makale _makale = new Makale();
                    if (file != null && file.ContentLength > 0)
                    {
                        MemoryStream memoryStream = file.InputStream as MemoryStream;
                        if (memoryStream == null)
                        {
                            memoryStream = new MemoryStream();
                            file.InputStream.CopyTo(memoryStream);
                        }
                        _makale.Foto = memoryStream.ToArray();
                    }
                    _makale.Baslik = m.Baslik;
                    _makale.OlusturmaTarihi = DateTime.Now;
                    _makale.Icerik = m.Icerik;
                    context.Makale.Add(_makale);
                    context.SaveChanges();
                    return RedirectToAction("Makale", "Admin");
                }
            }
            catch (Exception ex)
            {
                throw new Exception("Eklerken hata oluştu" + ex.Message);
            }
        }