Utilizing SharePoint Form Controls (like OWSDateField)

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

using Microsoft.SharePoint.WebControls;

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

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

        #endregion

        #region custom properties

        /// <summary>
        /// Gets or set the number of lines for the richtext control. 
        /// </summary>
        public int NumLines
        {
            get
            {
                if (ViewState["NumLines"] == null)
                    NumLines = 1;
                return (int)ViewState["NumLines"];
            }
            set { ViewState["NumLines"] = value; }
        }

        #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 {4}(frm, \"{0}\", \"{1}\", \"{2}\"); " +
                "fld.fRequired = {3}; " +
                "{5}" +
                "fld.IMEMode=\"\"; " +
                "fld.BuildUI(); " +
                "</SCRIPT>",
                UniqueID,
                Display,
                JavaScriptValue,
                Required.ToString().ToLower(),
                (NumLines == 1) ? "TextField" : "NoteField",
                (NumLines == 1) ? 
                    "fld.cchMaxLength = \"\"; " +
                    "fld.cchDisplaySize = \"\"; " : 
                    string.Format("fld.stNumLines = \"{0}\"; ", NumLines)
            );
        }
        #endregion
    }
}