How to set the default value for Html.DropDownListFor in MVC

Question

i have following code : controller method:

 public ActionResult Register(int? registrationTypeId)
        {
            IEnumerable

        

Answer 1

The Wrong Way To Do This

var accountTypes = new SelectList(accountTypes, "AccountTypeId", "AccountTypeName");

foreach(var item in accountList)
    if (item.AccountTypeId == registrationTypeId)
        item.Selected = true;

ViewBag.AccountTypes = accountTypes;

In view,

@Html.DropDownListFor(n => n.AccountType, (SelectList)ViewBag.AccountTypes)