Model is null when form submitted

Question

When I hit submit, the file parameter is null.

public ActionResult Create() {   return View(new FileViewModel()); }  [HttpPost]     [InitializeBlobHelper] public ActionResult Create(FileViewModel file) {   if (ModelState.IsValid)   {      //upload file   }   else     return View(file); }  public class FileViewModel {   internal const string UploadingUserNameKey = "UserName";   internal const string FileNameKey = "FileName";    internal const string Folder = "files";    private readonly Guid guid = Guid.NewGuid();    public string FileName   {     get     {       if (File == null)         return null;       var folder = Folder;       return string.Format("{0}/{1}{2}", folder, guid, Path.GetExtension(File.FileName)).ToLowerInvariant();     }   }    [RequiredValue]   public HttpPostedFileBase File { get; set; } } 

Here is the cshtml:

@model MyProject.Controllers.Admin.FileViewModel  @{   ViewBag.Title = "Create";   Layout = "~/Views/Shared/_BackOfficeLayout.cshtml"; }  @using (Html.BeginForm("Create", "Files", FormMethod.Post, new { enctype = "multipart/form-data" })) {   <fieldset>     <legend>Create</legend>      <div class="editor-label">       @Html.LabelFor(model => model.File)     </div>     <div class="editor-field">       @Html.TextBoxFor(model => model.File, new { type = "file" })       @Html.ValidationMessageFor(model => model.File)     </div>      <p>       <input type="submit" value="Create" />     </p>   </fieldset> }  <div>   @Html.ActionLink("Back to List", "Index") </div> 

Answer 1

It's naming conflict and binder trying to bind your File property to FileViewModel object with file name, that's why you get null. POST names are case-insensitive.

Change:

public ActionResult Create(FileViewModel file) 

To:

public ActionResult Create(FileViewModel model) 

or to any other name