e il codice:
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;

namespace Melis.Web.HttpHandler
{
    public class Working: IHttpHandlerFactory
    {
        #region IHttpHandlerFactory Members

        public virtual IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated)
        {
            return PageParser.GetCompiledPageInstance("~/Working.aspx", context.Server.MapPath("~/Working.aspx"), context);
        }

        public void ReleaseHandler(IHttpHandler handler)
        {

        }

        #endregion
    }
}