Passing id of selected dropdown option and send it to controller

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ASP.NET

drop-down

MVC3

Hi to all! I'm new to mvc3 and i am creating the search module....
In my form i have two drop down list called state and district where district depend on selection of state....
I have created view model for state and district

public class State_district
    {
       
       public int selectedDistrictid{get;set;}
        public IEnumerable<State> states { get; set; }
        public State stateid{ get; set; }
        public string selectedstate { get; set; }
        public IEnumerable<District> districts{get;set;}
        public District distId { get; set; }
       
    }

in the controller:

public ActionResult Index()
        {
            var model = new State_district { states = db.States, districts = from m in db.Districts select m };
            return View(model);
        }

and in the view , i am calling the dropdown using following:

<div class="editor-field">*Select State:-
           @Html.DropDownListFor(x => x.states, new SelectList(Model.states, "Id", "State_Name"), new {id = "states"})

          </div>

I want to get value of selected state's id and district-id and depending on that i need to get result from my database table. so i need to pass this value to controller where other action link will help to find data from table

Can someone help me with this.....