public override void Init()

        {

            base.Init();

            foreach (string moduleName in this.Modules)

            {

                string appName = "APPNAME";

                IHttpModule module = this.Modules[moduleName];

                SessionStateModule ssm = module as SessionStateModule;

                if (ssm != null)

                {

                    FieldInfo storeInfo = typeof(SessionStateModule).GetField("_store", BindingFlags.Instance | BindingFlags.NonPublic);

                    SessionStateStoreProviderBase store = (SessionStateStoreProviderBase)storeInfo.GetValue(ssm);

                    if (store == null)//In IIS7 Integrated mode, module.Init() is called later

                    {

                        FieldInfo runtimeInfo = typeof(HttpRuntime).GetField("_theRuntime", BindingFlags.Static | BindingFlags.NonPublic);

                        HttpRuntime theRuntime = (HttpRuntime)runtimeInfo.GetValue(null);

                        FieldInfo appNameInfo = typeof(HttpRuntime).GetField("_appDomainAppId", BindingFlags.Instance | BindingFlags.NonPublic);

                        appNameInfo.SetValue(theRuntime, appName);

                    }

                    else

                    {

                        Type storeType = store.GetType();

                        if (storeType.Name.Equals("OutOfProcSessionStateStore"))

                        {

                            FieldInfo uribaseInfo = storeType.GetField("s_uribase", BindingFlags.Static | BindingFlags.NonPublic);

                            uribaseInfo.SetValue(storeType, appName);

                        }

                    }

                }

            }

        }