Spinner Help

Hello!! I want a spinner in my app, but when I try to add items to this shows me an error with Android.Resource.Layout.SimpleSpinnerDropDownItem Android.Resource.Layout.SimpleSpinnerItem and does not recognize

Code: ArrayAdapter dataAdapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleSpinnerItem, list); dataAdapter.SetDropDownViewResource (Android.Resource.Layout.SimpleSpinnerDropDownItem); spinner.Adapter = dataAdapter;