How to get select drop down MVC

See more:

MVC

MVC3

i have collection of data

i want to select ddl on basis of previous selection

   @for (int i = 0; i < Model.listAddressEnity.Count; i++)
                    {
     @Html.DropDownListFor(x => x.listAddressEnity[i].City_ID, (SelectList)ViewBag.City_ID)
}

var selectList = new SelectList(objCityHandler.SP_GET_CITY().Select(s => new { Id = s.City_ID, Name = s.City_Name }), "Id", "Name");
               ViewBag.City_ID = selectList;

My problem is data in List

No problem in single data

var selectList = new SelectList(objCategoryHandler.SP_GET_CATEGORY().Select(s => new { Id = s.Categoty_ID, Name = s.Category_Name }), "Id", "Name", objProductCollectionEntity.ProductEntity.Categoty_ID);

but how to do selection with List