Не работает Ajax.BeginForm в цикле for

Представление:

@model List<Craft.Models.Entity.Work>
@for (int i = 0; i < Model.Count; i++)
{
    <div id="form_@i">
        @using (Ajax.BeginForm("EditSampleWork","Works",
            new AjaxOptions { UpdateTargetId = "form_" + i.ToString() }, 
            new { id = "Form_" + i }))
        {
            @Html.AntiForgeryToken()
            @Html.HiddenFor(model => Model[i].Id)
            @Html.HiddenFor(model => model[i].UserCraftId)
            @Html.HiddenFor(model => model[i].UserPriceId)
            @Html.HiddenFor(model => model[i].UserPrice)
            <div class="row">
                @Html.EditorFor(model => Model[i].TitleDiscription)
                @Html.EditorFor(model => Model[i].Discription)
                @Html.EditorFor(model => model[i].Price)
                @Html.EditorFor(model => model[i].TimeWork)
            </div>
            <input type="submit" name="btnsave_@i"  value="Сохранить" />
        }
    </div>
}   

Метод контроллера:

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> EditSampleWork(Work model)
{
    if (ModelState.IsValid)
    {
        db.Entry(model).State = EntityState.Modified;
        await db.SaveChangesAsync();
        return PartialView();
    }

    return PartialView("Works", model);
}

В контроллере в model приходит все null.