How to change tab on bottom navigationbar

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public void OnTabSelected(int position) { switch (position) { case 0: Toast.MakeText(ApplicationContext, "Tab History!", ToastLength.Short).Show(); break; case 1: Intent realtimeIntent = new Intent(this, typeof(RealtimeActivity)); StartActivity(realtimeIntent); break; case 2: Toast.MakeText(ApplicationContext, "Tab Setting!", ToastLength.Short).Show(); break; } }