Using ModelState.AddModelError for exception reporting

gistfile1.cs

[HttpPost]
public ActionResult Edit(DonorViewModel model)
{
    try
    {
        var donor = db.Donors.Get(model.Donor_ID);

        model.CreatedOn = donor.CreatedOn;
        model.DonorType_ID = donor.DonorType_ID;
        model.ModifiedOn = DateTime.Now;

        SetupEditViewData(model);

        db.Donors.Update(model);

        return RedirectToAction("Index");
    }
    catch (Exception ex)
    {
        ModelState.AddModelError(string.Empty, ex.Message);
        return View(model);
    }
}

Well, two questions:

1. What do you expect the users to do with the Model Error?

2. Do you still display the model even if there are errors?

The only thing the users can do is report the error.

I would still display the model values on error.