Utilizing SharePoint Form Controls (like OWSDateField)

using System;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

namespace OWSControls
{
    public class OWSChoiceField : OWSBase
    {
        #region construction

        /// <summary>
        /// Default constructor
        /// </summary>
        public OWSChoiceField() { }

        #endregion

        #region internal members

        ListItemCollection _items = new ListItemCollection();

        #endregion

        #region public properties

        /// <summary>
        /// Indicates the choice format of the display
        /// </summary>
        public SPChoiceFormatType ChoiceFormat
        {
            get
            {
                if (ViewState["ChoiceFormat"] == null)
                    ChoiceFormat = SPChoiceFormatType.Dropdown;
                return (SPChoiceFormatType)ViewState["ChoiceFormat"];
            }
            set { ViewState["ChoiceFormat"] = value; }
        }

        /// <summary>
        /// Gets the list items. 
        /// </summary>
        public ListItemCollection Items
        {
            get { return _items; }
        }

        #endregion

        #region overridden properties

        /// <summary>
        /// Gets the text of the selected item.
        /// </summary>
        public override string Text
        {
            get 
            {
                ListItem item = null;
                for (int x = 0; x < Items.Count && item == null; x++)
                {
                    if (Items[x].Value == Value)
                        item = Items[x];
                }
                if (item == null)
                    return "";
                return item.Text;
            }
        }

        #endregion

        #region overridden methods

        /// <summary>
        /// Renders the OWS Control
        /// </summary>
        /// <param name="wtr">writes out the text control information</param>
        protected override void Render(HtmlTextWriter wtr)
        {
            wtr.Write(
                "<SCRIPT>" +
                "fld = new ChoiceField(frm, \"{0}\", \"{1}\", \"{2}\");" +
                "fld.format = \"{3}\";" +
                "{4};" +
                "fld.fRequired = {5};" +
                "fld.IMEMode=\"\";" +
                "fld.BuildUI();" +
                "</SCRIPT>",
                UniqueID,
                Display,
                JavaScriptValue,
                ChoiceFormat.ToString(),
                GetChoicesJScript(),
                Required.ToString().ToLower()
            );
        }

        #endregion

        #region helper methods

        /// <summary>
        /// Gets the javascript to add choice to the end user. 
        /// </summary>
        /// <returns>the choices javascript</returns>
        private string GetChoicesJScript()
        {
            string ret = "";
            foreach (ListItem item in _items)
            {
                ret += string.Format(
                    "fld.AddChoice(\"{0}\",\"{1}\");",
                    item.Text.Replace(@"\", @"\\").Replace("\"", "\\\""),
                    item.Value.Replace(@"\", @"\\").Replace("\"", "\\\"")
                );
            }
            return ret;
        }

        #endregion

    }
}