notworking.cs

@using (Html.BeginForm("PostData", "Home", FormMethod.Post))
{
    @(Html.Grid(Model.Items)
          .RenderUsing(new PostAsListRenderer<ItemModel>("list"))
          .Columns(c =>
          {
              c.Custom(
                @<text>
                        @Html.HiddenFor(x => item.Id)
                       @item.Id
                </text>).Named("Id");
              c.For(x => Html.TextBoxFor(y => x.Name)).Named("Name");
              c.For(x => Html.TextBoxFor(y => x.Description)).Named("Description");
              c.For(x => Html.DropDownListFor(y => x.SelectedItem, Model.SelectListItems)).Named("DropDown");
          }))

    <input type="submit" value="submit" />
}