Fill picker from table

class TypeRequstTB
    {
        public int IdTypeReuqst { get; set; }
        public string NameTypeRequest { get; set; }
    }

_TypeRequst = new Picker();
_TypeRequst.ItemsSource = db.Table<TypeRequstTB>().OrderBy(x =>x.NameTypeRequest).ToList();
_TypeRequst.Title = "NameTypeRequest";
_TypeRequst.SelectedItem = "IdTypeReuqst";
stackLayout.Children.Add(_TypeRequst);