I have a controller method CreateOrUpdate, this method is supposed to save the car to the database and then return as normal.
public ActionResult CreateOrUp
it should be the ModelState problem. if you use Htmlhelper to Display id value. Default HtmlHelper display ModelState value not Model. Try display model value in view
@Model.id
or Clean ModelState Value in controller
ModelState.Clear();
or reset id value after SaveChange.
theCar.Save();
ModelState["id"].Value = theCar.id
return View(theCar);
Reset the value of textarea after form submission