/// <summary> /// set The custom string to check if the LIst of users have changed /// and consider the page /// </summary> /// <param name="context"></param> /// <param name="arg"></param> /// <returns></returns> public override string GetVaryByCustomString(HttpContext context, string arg) { if (arg == "CountUsers") { IDataContext<Person> dt = new TestDataContext(); return context.Request.Url.Query + dt.CountUsers().ToString(); } return ""; }