/// <devdoc>///    <para>[To be supplied.]</para>/// </devdoc>void OnReleaseState(Object source, EventArgs eventArgs) {HttpApplication             app;HttpContext                 context;bool                        setItemCalled = false;Debug.Trace("SessionStateOnReleaseState", "Beginning SessionStateModule::OnReleaseState");Debug.Assert(!(_rqAddedCookie && !_rqIsNewSession),"If session id was added to the cookie, it must be a new session.");// !!!// Please note that due to InProc session id optimization, this function should not// use _rqId directly because it can still be null.  Instead, use DelayedGetSessionId().
_releaseCalled = true;app = (HttpApplication)source;context = app.Context;ChangeImpersonation(context, false);try {if (_rqSessionState != null) {bool delayedSessionState = (_rqSessionState == s_delayedSessionState);Debug.Trace("SessionStateOnReleaseState", "Remove session state from context");SessionStateUtility.RemoveHttpSessionStateFromContext(_rqContext, delayedSessionState);/** Don't store untouched new sessions.*/if (// The store doesn't have the session state.// ( Please note we aren't checking _rqIsNewSession because _rqIsNewSession// is lalso true if the item is converted from temp to perm in a GetItemXXX() call.)
                                _rqSessionStateNotFound// OnStart is not defined&& _sessionStartEventHandler == null// Nothing has been stored in session state&& (delayedSessionState || !_rqSessionItems.Dirty)&& (delayedSessionState || _rqStaticObjects == null || _rqStaticObjects.NeverAccessed)) {Debug.Trace("SessionStateOnReleaseState", "Not storing unused new session.");}else if (_rqSessionState.IsAbandoned) {Debug.Trace("SessionStateOnReleaseState", "Removing session due to abandonment, SessionId=" + _rqId);if (_rqSessionStateNotFound) {// The store provider doesn't have it, and so we don't need to remove it from the store.// However, if the store provider supports session expiry, and we have a Session_End in global.asax,// we need to explicitly call Session_End.if (_supportSessionExpiry) {if (delayedSessionState) {Debug.Assert(s_allowDelayedStateStoreItemCreation, "s_allowDelayedStateStoreItemCreation");Debug.Assert(_rqItem == null, "_rqItem == null");InitStateStoreItem(false /*addToContext*/);}_onEndTarget.RaiseSessionOnEnd(ReleaseStateGetSessionID(), _rqItem);}}else {Debug.Assert(_rqItem != null, "_rqItem cannot null if it's not a new session");// Remove it from the store because the session is abandoned.
                            _store.RemoveItem(_rqContext, ReleaseStateGetSessionID(), _rqLockId, _rqItem);}}else if (!_rqReadonly ||(_rqReadonly &&_rqIsNewSession &&_sessionStartEventHandler != null &&!SessionIDManagerUseCookieless)) {// We need to save it since it isn't read-only// See Dev10 588711: Issuing a redirect from inside of Session_Start event // triggers an infinite loop when using pages with read-only session state// We save it only if there is no error, and if something has changed (unless it's a new session)if (    context.Error == null   // no error&& (    _rqSessionStateNotFound|| _rqSessionItems.Dirty    // SessionItems has changed.|| (_rqStaticObjects != null && !_rqStaticObjects.NeverAccessed) // Static objects have been accessed|| _rqItem.Timeout != _rqSessionState.Timeout   // Timeout value has changed
                                    )) {if (delayedSessionState) {Debug.Assert(_rqIsNewSession, "Saving a session and delayedSessionState is true: _rqIsNewSession must be true");Debug.Assert(s_allowDelayedStateStoreItemCreation, "Saving a session and delayedSessionState is true: s_allowDelayedStateStoreItemCreation");Debug.Assert(_rqItem == null, "Saving a session and delayedSessionState is true: _rqItem == null");InitStateStoreItem(false /*addToContext*/);}#if DBGif (_rqSessionItems.Dirty) {Debug.Trace("SessionStateOnReleaseState", "Setting new session due to dirty SessionItems, SessionId=" + _rqId);}else if (_rqStaticObjects != null && !_rqStaticObjects.NeverAccessed) {Debug.Trace("SessionStateOnReleaseState", "Setting new session due to accessed Static Objects, SessionId=" + _rqId);}else if (_rqSessionStateNotFound) {Debug.Trace("SessionStateOnReleaseState", "Setting new session because it's not found, SessionId=" + _rqId);}else {Debug.Trace("SessionStateOnReleaseState", "Setting new session due to options change, SessionId=" + _rqId +"\n\t_rq.timeout=" + _rqItem.Timeout.ToString(CultureInfo.InvariantCulture) +", _rqSessionState.timeout=" + _rqSessionState.Timeout.ToString(CultureInfo.InvariantCulture));}
#endifif (_rqItem.Timeout != _rqSessionState.Timeout) {_rqItem.Timeout = _rqSessionState.Timeout;}s_sessionEverSet = true;setItemCalled = true;_store.SetAndReleaseItemExclusive(_rqContext, ReleaseStateGetSessionID(), _rqItem, _rqLockId, _rqSessionStateNotFound);}else {// Can't save it because of various reason.  Just release our exclusive lock on it.Debug.Trace("SessionStateOnReleaseState", "Release exclusive lock on session, SessionId=" + _rqId);if (!_rqSessionStateNotFound) {Debug.Assert(_rqItem != null, "_rqItem cannot null if it's not a new session");_store.ReleaseItemExclusive(_rqContext, ReleaseStateGetSessionID(), _rqLockId);}}}
#if DBGelse {Debug.Trace("SessionStateOnReleaseState", "Session is read-only, ignoring SessionId=" + _rqId);}
#endifDebug.Trace("SessionStateOnReleaseState", "Returning from SessionStateModule::OnReleaseState");}if (_rqAddedCookie && !setItemCalled && context.Response.IsBuffered()) {_idManager.RemoveSessionID(_rqContext);}}finally {RestoreImpersonation();}// WOS 1679798: PERF: Session State Module should disable EndRequest on successful cleanupbool implementsIRequiresSessionState = context.RequiresSessionState;if (HttpRuntime.UseIntegratedPipeline && (context.NotificationContext.CurrentNotification == RequestNotification.ReleaseRequestState) && (s_canSkipEndRequestCall || !implementsIRequiresSessionState)) {context.DisableNotifications(RequestNotification.EndRequest, 0 /*postNotifications*/);_acquireCalled = false;_releaseCalled = false;ResetPerRequestFields();}}

 else if (_rqSessionState.IsAbandoned) {Debug.Trace("SessionStateOnReleaseState", "Removing session due to abandonment, SessionId=" + _rqId);if (_rqSessionStateNotFound) {// The store provider doesn't have it, and so we don't need to remove it from the store.// However, if the store provider supports session expiry, and we have a Session_End in global.asax,// we need to explicitly call Session_End.if (_supportSessionExpiry) {if (delayedSessionState) {Debug.Assert(s_allowDelayedStateStoreItemCreation, "s_allowDelayedStateStoreItemCreation");Debug.Assert(_rqItem == null, "_rqItem == null");InitStateStoreItem(false /*addToContext*/);}_onEndTarget.RaiseSessionOnEnd(ReleaseStateGetSessionID(), _rqItem);}}else {Debug.Assert(_rqItem != null, "_rqItem cannot null if it's not a new session");// Remove it from the store because the session is abandoned.
                            _store.RemoveItem(_rqContext, ReleaseStateGetSessionID(), _rqLockId, _rqItem);}}