London Boroughs DropDownList DataType for Umbraco

LondonBoroughs.cs

using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;
using umbraco.cms.businesslogic.datatype;

namespace Our.Umbraco.DataTypes
{
	public class LondonBoroughs : AbstractDataEditor
	{
		private DropDownList m_Control = new DropDownList();

		// ref: http://en.wikipedia.org/wiki/London_boroughs
		public IDictionary<string, string> BoroughDictionary = new Dictionary<string, string>
		{
			{ "Barking and Dagenham", "barking-and-dagenham" },
			{ "Barnet", "barnet" },
			{ "Bexley", "bexley" },
			{ "Brent", "brent" },
			{ "Bromley", "bromley" },
			{ "Camden", "camden" },
			{ "City of London", "city-of-london" },
			{ "City of Westminster", "city-of-westminster" },
			{ "Croydon", "croydon" },
			{ "Ealing", "ealing" },
			{ "Enfield", "enfield" },
			{ "Greenwich", "greenwich" },
			{ "Hackney", "hackney" },
			{ "Hammersmith and Fulham", "hammersmith-and-fulham" },
			{ "Haringey", "haringey" },
			{ "Harrow", "harrow" },
			{ "Havering", "havering" },
			{ "Hillingdon", "hillingdon" },
			{ "Hounslow", "hounslow" },
			{ "Islington", "islington" },
			{ "Kensington and Chelsea", "kensington-and-chelsea" },
			{ "Kingston upon Thames", "kingston-upon-thames" },
			{ "Lambeth", "lambeth" },
			{ "Lewisham", "lewisham" },
			{ "Merton", "merton" },
			{ "Newham", "newham" },
			{ "Redbridge", "redbridge" },
			{ "Richmond upon Thames", "richmond-upon-thames" },
			{ "Southwark", "southwark" },
			{ "Sutton", "sutton" },
			{ "Tower Hamlets", "tower-hamlets" },
			{ "Waltham Forest", "waltham-forest" },
			{ "Wandsworth", "wandsworth" }
		};

		public override string DataTypeName
		{
			get
			{
				return "London Boroughs (DropDownList)";
			}
		}

		public override Guid Id
		{
			get
			{
				return new Guid("9C073C92-3649-4E58-9924-E3045E5A3F20");
			}
		}

		public LondonBoroughs()
		{
			base.RenderControl = this.m_Control;

			this.m_Control.Init += new EventHandler(this.m_Control_Init);

			base.DataEditorControl.OnSave += new AbstractDataEditorControl.SaveEventHandler(this.DataEditorControl_OnSave);
		}

		private void m_Control_Init(object sender, EventArgs e)
		{
			this.m_Control.DataSource = this.BoroughDictionary;
			this.m_Control.DataTextField = "Key";
			this.m_Control.DataValueField = "Value";
			this.m_Control.DataBind();

			if (base.Data.Value != null)
			{
				this.m_Control.SelectedValue = base.Data.Value.ToString();
			}
		}

		private void DataEditorControl_OnSave(EventArgs e)
		{
			base.Data.Value = this.m_Control.SelectedValue;
		}
	}
}