When combobox selected show data in checkboxes in MVC4

I have the combobox that when selected retrieve data from db and show any data in checkbox. my controller :

public ActionResult GetObisCode(int meterId){

var blobis = new ObisInfoRepository();

var model = new SettingViewModel();

model.obiscode = blobis.Where(m => m.MeterID_FK == meterId).ToList();

return View("PartialSetting",model); }

and my partial view for show checkbox:

foreach (var i in model.obiscode) {

@Html.HiddenFor(it => it[i].ObisInfoID)

@Html.TextBoxFor(it => it[i].ObisInfCode)

@Html.CheckBoxFor(it => it[i].Checkbox)

}

but error in partial view. how to show this?