basetype basetype

this initial doubt here i wish i pristine good hopefully won't too mind-numbingly easy.

i have following category subsim extends sim, fluctuating mainsim. totally removed category (and library well) i need check an vigilant being upheld by form mainsim. following finished check;

type t = gettype(sim);
//in case, sim = subsim
if (t != null)
{
  relapse t.basetype == typeof(mainsim);
}

obviously t.basetype going relapse sim given type.basetype gets form tide form directly inherits.

short carrying t.basetype.basetype mainsub, there any proceed repremand form controlling .net libraries? there overrides redefined relapse sure class?

thank advance