Follow bellow code in global.asax protected void Application_AcquireRequestState( object sender, EventArgs e) { try { string lcReqPath = Request.Path.ToLower(); // Session is not stable in AcquireRequestState - Use Current.Session instead. System.Web.SessionState. HttpSessionState curSession = HttpContext .Current.Session; if (lcReqPath != "/root/login.aspx" && (curSession == null || curSession[ "User_Type" ] == null )...