Using and Developing an AutoSuggest ASP.NET Server Control Library

/* AutoSuggest ASP.NET server controls, version 1.0, September 1st, 2009.
 * (c) 2009 Jason Ensinger (jason_ensinger@hotmail.com)
 *
 * Latest version download and documentation:
 * http://www.codeproject.com/
 * 
 * Based on Auto-suggest control, version 2.3, August 18th 2009
 * by Dmitriy Khudorozhkov (dmitrykhudorozhkov@yahoo.com).
 * http://www.codeproject.com/KB/scripting/AutoSuggestControl.aspx
 *
 * Based on "Auto-complete Control" by zichun:
 * http://www.codeproject.com/KB/scripting/jsactb.aspx
 *
 * This software is provided "as-is", without any express or implied warranty.
 * In no event will the author be held liable for any damages arising from the
 * use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */
using System.Web.UI;
using System.Text;
using System;
namespace AutoSuggest
{
    public partial class AutoSuggestTextBox
    {
        protected override void OnPreRender(EventArgs e)
        {
            if (!Page.ClientScript.IsClientScriptBlockRegistered("autosuggest"))
            {
                string path = ResolveUrl(this.ScriptPath);
                string script = "<script type=\"text/javascript\" src=\""
                    + path + "\"></script>";
                Page.ClientScript.RegisterClientScriptBlock(typeof(Page)
                    , "autosuggest", script);
            }
            base.OnPreRender(e);
        }

        protected override void Render(HtmlTextWriter writer)
        {
            RenderContents(writer);
            if (!this.DesignMode)
            {
                RenderScript(writer);
                Page.ClientScript.RegisterHiddenField(this.UniqueID + "$SelectedText"
                    , this.SelectedText);
                Page.ClientScript.RegisterHiddenField(this.UniqueID + "$SelectedValue"
                    , this.SelectedValue);
                Page.ClientScript.RegisterHiddenField(this.UniqueID + "$SelectedIndex"
                    , this.SelectedIndex.ToString());
            }
        }
    }
}