How to get default selection into selectlist MVC - asp.net-mvc-4

Question

I need to use dropdownlist into razor and related object into model object.
I want to keep default selected value for the object but it did not work out.
Can any one suggest me what should be the best way to achieve this - what to keep into DTO property and controller action and razor syntax.
Below is my current stuff:
public class StateDTO
{
public int ID { get; set; }
public string Name { get; set; }
}
public class RegisterModel
{
[Required]
[Display(Name = "User name", Order = 2)]
public string UserName { get; set; }
[Required]
[StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
[DataType(DataType.Password)]
[Display(Name = "Password", Order = 3)]
public string Password { get; set; }
[DataType(DataType.Password)]
[Display(Name = "Confirm password", Order = 4)]
[Compare("Password", ErrorMessage = "The password and confirmation password do not match.")]
public string ConfirmPassword { get; set; }
[Display(Name = "Email Address", Order = 1)]
[DataType(DataType.EmailAddress)]
[Required(AllowEmptyStrings = false, ErrorMessage = "Please enter value")]
public string Email { get; set; }
public IEnumerable<SelectListItem> States { get; set; }
public SelectListItem State { get; set; }
}
public ActionResult Register()
{
RegisterModel r = new RegisterModel();
IList<StateDTO> s = new List<StateDTO>();
s.Add(new StateDTO() { ID = 1, Name = "CA" });
s.Add(new StateDTO() { ID = 2, Name = "LA" });
s.Add(new StateDTO() { ID = 3, Name = "AR" });
r.State = new SelectListItem() { Text = s[2].Name, Value = s[2].ID.ToString(), Selected = true };
r.States = new SelectList(s, "ID", "Name",r.State);
return View(r);
}
View contains below related stuff:
<div class="editor-label">
#Html.LabelFor(model => model.State)
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.State, Model.States)
#Html.ValidationMessageFor(model => model.State)
</div>
Please suggest me what should I change into Model object, controller and razor view to achieve default selection of dropdown list... any best way.
Thank You

Answer 1

I have modified the stuff as follow the below link and it worked out.
dropdownlist set selected value in MVC3 Razor
In model, changed the property type as follow:
public IEnumerable<SelectListItem> States { get; set; }
public int State { get; set; }
Controller action:
IList<StateDTO> s = new List<StateDTO>();
s.Add(new StateDTO() { ID = 1, Name = "CA" });
s.Add(new StateDTO() { ID = 2, Name = "LA" });
s.Add(new StateDTO() { ID = 3, Name = "AR" });
r.State = 3;
r.States = new SelectList(s, "ID", "Name",3);
View is as follow:
<div class="editor-label">
#Html.LabelFor(model => model.State)
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.State, Model.States)
#Html.ValidationMessageFor(model => model.State)
</div>
It works...got default selection.
Thank you