WFFM custom drop down field (used in MVC)

CustomDropDownListField.cs

public class CustomDropDownListField : DropListField
    {
        public CustomDropDownListField()
        {
            //initalise services here
        }

        private string InitialSelection { get; set; }

        public override void Initialize()
        {
            var customItems = null;  //get your list of items here from your service

            selectItems = new List<SelectListItem>();

            if (Parameters.ContainsKey("initialselection"))
                InitialSelection = Parameters["initialselection"];

            var CustomSelected = false;
            foreach (var item in customItems)
            {
                if (string.Equals(item.Name, InitialSelection, StringComparison.InvariantCultureIgnoreCase))
                    CustomSelected = true;

                selectItems.Add(new SelectListItem
                {
                    Value = item.Name,
                    Text = item.Name,
                    Selected = CustomSelected
                });
            }

            if (Parameters.ContainsKey("showemptychoice"))
            {
                var emptyChoiceText = Parameters.ContainsKey("emptychoicetext") &&
                                      !string.IsNullOrEmpty(Parameters["emptychoicetext"])
                    ? Parameters["emptychoicetext"]
                    : "please select";
                var showEmptyChoice = Parameters["showemptychoice"] == "Yes";
                if (showEmptyChoice)
                    Items.Insert(0,
                        new SelectListItem {Text = string.Format("-- {0} --", emptyChoiceText), Value = string.Empty});
            }
            EmptyChoise = false;
            base.Initialize();
        }
    }