public ActionResult Editar(ModeloModel item, FormCollection form)
{
Guid marcaID = Guid.Empty;
if (Guid.TryParse(form["Marcas"], out marcaID))
{
item.MarcaID = marcaID;
}
ContextHelper.AlterarModelo(ConverterHelper <ModeloModel, Modelo> .ConvertAParaB(item));
return(RedirectToAction("Index"));
}