c# - COM object that has been separated from its underlying RCW cannot be used with Outlook -

i have application loads email-addresses list , uses these autocompletion in textbox. if close application while these addresses still being retrieved invalidcomobjectexception unhandled user code error.

the error specified on piece of code:

  outlook.namespace ons = ((microsoft.office.interop.outlook.application)outlookobj).getnamespace("mapi"); 

this entire auto-completion class:

     class autocomplete {     list<string> emaillist = new list<string>();     outlook.application outlookobj = new outlook.application();     string[] names;      public list<string> getemails()     {              outlook.addresslists addresslists = outlookobj.session.addresslists;             outlook.addresslist gal = addresslists["all users"];             outlook.addressentries addrentries = gal.addressentries;             names = new string[addrentries.count];              (int = 1; < addrentries.count; i++)             {                 outlook.addressentry exchdlmember = addrentries[i];                 outlook.namespace ons = ((microsoft.office.interop.outlook.application)outlookobj).getnamespace("mapi");                 outlook.recipient recip = ons.createrecipient(exchdlmember.name);                 recip.resolve();                 if (recip.address != null && recip.addressentry != null)                 {                     if (recip.addressentry.getexchangeuser().primarysmtpaddress != null)                     {                         names[i] = recip.addressentry.getexchangeuser().primarysmtpaddress;                     }                 }             }             foreach (string combo in names)             {                 if (combo != null)                 {                     emaillist.add(combo);                 }                 else { }             }             return emaillist;       } } 

the backgroundworker methods in form:

void form1_shown(object sender, eventargs e)     {         bgw.runworkerasync();         bgw.workersupportscancellation = true;     }      void bgw_dowork(object sender, doworkeventargs e)     {         bgw.workersupportscancellation = true;         if(textbox1.invokerequired)         {                             emails = autocomplete.getemails();             collection.addrange(emails.toarray());                             textbox1.invoke(new methodinvoker(delegate { textbox1.autocompletecustomsource = collection; }));         }                      (int = 100; <= 100; i++)         {             bgw.reportprogress(i);             if (i == 100)             {                 label2.invoke(new methodinvoker(delegate { label2.text = "global address list loaded!"; }));                 label2.invoke(new methodinvoker(delegate { label2.backcolor = system.drawing.color.lightgreen; }));             }         }     } 

and upon closing form:

   private void form1_formclosing(object sender, formclosingeventargs e)     {         bgw.cancelasync();              } 

anyone have idea preventing error?

hans passant: sure, environment.exit(). bam, gone.

adding enviroment.exit(0); form1_formclosing() hans said did trick gets closed when exiting application now.