如何在TryUpdateModel()函数中生成错误?

我想测试一个Try Catch的Catch分支，但我不明白如何在TryUpdateModel(ture)中生成错误?我正在使用VS 2013 Web Express。我尝试使用F10，它去捕捉，但没有产生错误。我希望能够看到和错误在我的返回视图页。

CheckoutController.cs

public ActionResult AddressAndPayment(FormCollection values)
{
    var facture = new Facture();
    TryUpdateModel(facture);        //I would like to generate an error here
    try
    {
        facture.DateFact = DateTime.Now; 
        //Process the order
        var cart = ShoppingCart.GetCart(this.HttpContext);
        cart.CreateOrder(facture);
        return RedirectToAction("Complete", new { id = facture.FactureId });
    }
    catch
    {
        //Invalid - redisplay with errors
        return View(facture);
    }
}

Facture.cs

 using System.Collections.Generic;
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Web.Mvc;
 namespace Tp1WebStore3.Models
 {
    [Bind(Exclude = "FactureId")]
    public partial class Facture
    {
        [ScaffoldColumn(false)]
        public int FactureId { get; set; }
        [ScaffoldColumn(false)]
        public System.DateTime DateFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir votre Nom")]
        public string NomFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir votre Prenom")]
        public string PrenomFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir une adresse")]
        public string AdresseFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir une ville")]
        public string VilleFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir un code postal")]
        public string CodePostalFact { get; set; }
        [Required(ErrorMessage = "Vous devez saisir une adresse courriel")]
        [DisplayName("CourrielFact")]
        [RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+'.[A-Za-z]{2,4}",
        ErrorMessage = "Adresse courriel invalide.")]
        [DataType(DataType.EmailAddress)]
        public string CourrielFact { get; set; }
        public decimal TotalFact { get; set; }
        public List<Facture> Factures { get; set; }
    }
}

if (this.TryUpdateModel(something))
{
    // success
}
else 
{
    // handle failure
}

try
{
    this.UpdateModel(something);
}
catch(SomeException)
{
    // handle failure
}