validating_fields_mvc_1

validating_fields_mvc_1.cs

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(MyModel myModel)
{
	// Manually validate model in every action
	if(myModel.Item3 < myModel.Item1 + myModel.Item2)
	{
		ModelState.AddModelError("Item3", "Item1 + Item2 must be less than Item3");
		return View(myModel);
	}

	if (ModelState.IsValid)
	{
		db.MyModels.Add(myModel);
		db.SaveChanges();
		return RedirectToAction(nameof(Index));
	}

	return View(myModel);
}