Complex Binding not working with my dropdownlist?

Question

Hi

I have something like this

public class ViewModel
{
   public List<Books> Test {get; set;}
   public SelectList List {get; set;}

   public ViewModel()
   {
      Test = new List<Books>();
   }
}


public class Books 
{
     public string SelectedByUser {get; set;}
}



<% for (int i = 0; i < 1; i++)
   { %>               
        <%: Html.DropDownListFor(m => ViewModel.Books[i].SelectedByUser, SelectList);
<% } %

controller

ViewModel.Test.add(new Books() { SelectedByUser = 5});

html rendered

<select>
  <option value="1">1</option>
  <option value="5">5</option>
</select>

So it should put "5" as the selected option but it does not seem to bind it and make "5" the selected one.

If I "SelectedByuser" to the ViewModel then it will work but when it is in a list it does not.