c# - Session.Abandon Not Firing or Throwing error message -

i have following piece of code throwing error message need enable session on web.config, none of things have found far, can tell me how suppose working?.

i have tried place code within decline on page_load server seems avoid session's instructions:

    public partial class decline : datapage     {         protected decline() {             session.removeall();             session.clear();             session.abandon();             response.cookies.remove("accessed");         }         protected void page_load(object sender, eventargs e)        {              response.redirect("~/account/login.aspx");        }     } 

this full message:

session state can used when enablesessionstate set true, either in configuration file or in page directive. please make sure system.web.sessionstatemodule or custom session state module included in <configuration>\<system.web>\<httpmodules> section in application configuration

this running .net 4 framework , configurations coming following answer not quite fit current project. since providing .net mvc 2 solution. helpful there equivalent on .net 4

<system.webserver>    <modules runallmanagedmodulesforallrequests="true">     <remove name="session" />     <add name="session" type="system.web.sessionstate.sessionstatemodule, system.web, version=2.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a" />   </modules> </system.webserver> 

session state can used when enablesessionstate set true either in configuration

also provided page following line

<%@ page title="" language="c#" codefile="decline.aspx.cs" inherits="decline" enablesessionstate="true" %>  

which not make difference @ if there or not. running on iis 7.5

i had same problem , did in web.config add

  <system.webserver>      <modules runallmanagedmodulesforallrequests="true"/>   </system.webserver> 

and in page using

enablesessionstate="true" 

and can try remove 1 session , check if has been remove

session.remove("test"); if (session["test"] == null) { //woooo work ; } else { // ???? }