creating an instance category name

i'm perplexing emanate an instance category during run time. classes i'm perplexing emanate get bottom class, configmgrobj, named configmgr_xxxxxx e.g. configmgr_collection. take special vigilant i'm job ocontroller twine arguments.

this line i'm controlling it, where classtoget twine contains name category e.g. configmgr_collection.

object onewobject = system.activator.createinstance(null, "stack namespace." + classtoget, new object[] { ocontroller, classtoget });

this throws typeloadexception exception. what's adult it?