MyHandlerFactory

 

    public class MyHandlerFactory : IHttpHandlerFactory
    {
        public IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated)
        {
            PageHandlerFactory factory = (PageHandlerFactory)Activator.CreateInstance(typeof(PageHandlerFactory),true);
            IHttpHandler handler = factory.GetHandler(context, requestType, url, pathTranslated);
            if (handler is Page)
            {
                (handler as Page).Theme = "Blue";
            }
            return handler;
        }

        public void ReleaseHandler(IHttpHandler handler)
        {
        }
    }