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switching between uiviewcontrollers without a UI navigator control
vc1 = new viewc1();
    window.AddSubview(vc1.View);
    window.MakeKeyAndVisible ();

vc2 = new viewc2();
    PresentModalViewController(vc2, true);

if(vc1==nil)
  vc1 = new viewC1();
window.addSubView(vc1.view);
window.MakeKeyAndVisible ();

if(vc2==nil)
   vc2 = new viewC2();
if(vc1.view.superview!=nil){
   vc1.view.removefromSuperView();
   window.addsubview(vc2.view);
} else {
   vc2.view.removeFromSuperView();
   window.addsubview(vc1.view);
}

vc1.release();
vc2.release();

navigationController.ViewControllers = new UIViewController[1]{ vc2 };