c# - Unity 2.1 with asp.net concurrency issue -

we using unity 2.1 in asp.net application.

we using following code in beginrequest of global.asax:

public iunitycontainer getcontainer() {   enginecontainer container = new enginecontainer(_correl);   container.registerinstance(correlation, _correl);   foreach(dependencytypemap typemap in _typemaplist)   {      setupdi(container, typemap);   }   return container; }  private void setupdi(enginecontainer engcontainer, dependencytypemap map) {      foreach (var m in map.maps)     {         list<object> args = new list<object>();         args.add(engcontainer.correlationinfo);         if (m.item3 != null && m.item3.count() > 0)         {             args.addrange(m.item3);         }                    if (m.item4 != null && m.item4.count() > 0)         {             args.addrange(m.item4);         }         engcontainer.registertype(m.item1, m.item2, new injectionconstructor(args.toarray()));     }      if (map.isloggingenabled)     {         foreach (var type in map.typestointercept)         {             engcontainer.setupforinteception(type);         }     } } 

issue: value being passed registerinstance session id. in 1 of scenario value being passed registerinstance user a's id. however, in controller user b's id. so, when unity creating controller instance, incorrect session id being supplied controller.

question: registerinstance thread safe? cause of problem facing