MVC 3 – Html.EditorFor seems to cache old values after $.ajax call

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There is no caching involved here. It’s just how HTML helper work. They first look at the ModelState when binding their values and then in the model. So if you intend to modify any of the POSTed values inside your controller action make sure you remove them from the model state first:

[HttpPost]
public virtual ActionResult AjaxCreate(Transaction transaction)
{
    if (ModelState.IsValid)
    {
        service.InsertOrUpdate(transaction);
        service.Save();
    }
    service.ChosenCostCentreId = transaction.IdCostCentre;
    TransactionViewModel viewModel = new TransactionViewModel();
    ModelState.Remove("Transaction");
    viewModel.Transaction = new Transaction();
    ModelState.Remove("CostCentre");
    viewModel.CostCentre = service.ChosenCostCentre;
    ...

    return PartialView("_Create", viewModel);
}

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