.net - UserPrincipal.GetAuthorizationGroups throws exception -


in following code

principalcontext* context = new principalcontext(contexttype::domain, domainname); userprincipal* user = userprincipal::findbyidentity(context, identitytype::samaccountname, username); principalsearchresult<principal*>* groups = user->getauthorizationgroups();

i following exception:

message: object reference not set instance of object.

exception call stack:

 @ system.directoryservices.accountmanagement.principal.checkdisposedordeleted()  @ system.directoryservices.accountmanagement.userprincipal.getauthorizationgroupshelper()  @ system.directoryservices.accountmanagement.userprincipal.getauthorizationgroups()

any idea why internal method fails? how can user deleted or disposed, or has happened?


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