ActionBarCompat.CustomizedActivity.OnTabSelected C# (CSharp) Method

        public void OnTabSelected(ActionBar.Tab tab, Android.Support.V4.App.FragmentTransaction ft)
        {
            if (fragment == null)
            {
                fragment = new SampleTabFragment();
                var id = (int)Build.VERSION.SdkInt >= 14 ?
                Android.Resource.Id.Content :
                Resource.Id.action_bar_activity_content;

                ft.Add(id, fragment, "tag");
            }
            else
            {
                ft.Attach(fragment);
            }
            
        }