DropDownListFor výber nie je uložený - asp.net-mvc

Som nový pre MVC. Používam DropDownListFor na zobrazenie zoznamu názvov spoločností a na základe vykonaného výberu vyplnenie ďalších polí zákazníka. Polia zákazníka sú dobre osadené, ale keď sa pokúsim o POST záznamu, dostanem chybu overenia, že je požadovaný názov firmy, aj keď názov firmy bol vybraný v DropDownListFor. Tu je ViewModel:

     namespace CMSUsersAndRoles.Models
{
public class QuoteViewModel
{   [Key]
[Display(Name = "Quote Id")]
public int QuoteId { get; set; }
// Columns from Customer table
[Required(ErrorMessage = "Please select a company")]
[Display(Name = "Customer Id")]
public int? CustomerId { get; set; }
[Display(Name = "Sales Rep")]
public string SalesRep { get; set; }
[Display(Name = "First Name")]
public string FirstName { get; set; }
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Required]
public string Company { get; set; }
[Display(Name = "Address 1")]
public string Address1 { get; set; }
[Display(Name = "Address 2")]
public string Address2 { get; set; }
public string City { get; set; }
public string State { get; set; }
[StringLength(10)]
[Display(Name = "Zip Code")]
[RegularExpression(@"^d{5}(-d{4})?$", ErrorMessage = "Invalid Zip Code")]
public string PostalCode { get; set; }
[Phone]
[Display(Name = "Work Phone")]
public string WorkPhone { get; set; }
[Phone]
[Display(Name = "Cell Phone")]
public string CellPhone { get; set; }
[EmailAddress]
public string Email { get; set; }
[Range(0, 100)]
public decimal? Discount { get; set; }
[Display(Name = "Payment Terms")]
public int? PaymentTerms { get; set; }
// Columns from QuoteDetail table
[Display(Name = "Quote Detail")]
public List<QuoteDetail> QuoteDetail { get; set; }
// Columns from Quote table


public decimal Subtotal { get; set; }
public decimal Tax { get; set; }
public decimal Total { get; set; }
[DataType(DataType.Date)]
[Display(Name = "Quote Date")]
public DateTime? QuoteDate { get; set; }
[DataType(DataType.Date)]
[Display(Name = "Good Until")]
public DateTime? GoodUntil { get; set; }
[DataType(DataType.Date)]
[Display(Name = "Quote Sent")]
public DateTime? QuoteSent { get; set; }
[DataType(DataType.Date)]
[Display(Name = "Date Approved")]
public DateTime? DateApproved { get; set; }
[DataType(DataType.Date)]
[Display(Name = "Date Ordered")]
public DateTime? DateOrdered { get; set; }

}
}

Tu je kód z pohľadu:

    @Html.DropDownListFor(model => model.CustomerId, new SelectList(ViewBag.Customers, "CustomerId", "Company"), "---Select one---", new { htmlAttributes = new { @class = "company" } });
@Html.HiddenFor(model => model.Company)
@Html.ValidationMessageFor(model => model.Company, "", new { @class = "text-danger" })

Tu je Get:

public ActionResult Create()
{
QuoteViewModel qvm = new QuoteViewModel();

var customers = db.Customers.ToList();
ViewBag.Customers = customers;

return View(qvm);
}

A tu je kód pre POST:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(QuoteViewModel qvm)
{

if (ModelState.IsValid)
{
Quote quote1 = new Quote();

quote1.CustomerId = qvm.CustomerId;
...
customer.CustomerId = (int)qvm.CustomerId;
...
customer.Company = qvm.Company;

db.Entry(customer).State = EntityState.Modified;
try
{
db.SaveChanges();
}
catch (DbUpdateConcurrencyException ex)
{

var objContext = ((IObjectContextAdapter)db).ObjectContext;
// Get failed entry
var entry = ex.Entries.Single();
// Now call refresh on ObjectContext
objContext.Refresh(RefreshMode.ClientWins, entry.Entity);


}


return RedirectToAction("Index");
}

var customers = db.Customers.ToList();
ViewBag.Customers = customers;

return View(qvm);
}

Čo mi chýba? Akákoľvek pomoc bude veľmi cenená.

odpovede:

Nehodnotila som hodnotu HiddenFor nižšie. Ďakujeme, @StephenMuecke.

@Html.HiddenFor(model => model.Company)