Features such as Spinner, saving value changes with Shared Preference,

public class RD_OSBG : Fragment
{
    Spinner _BG_Position;

    public override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);

        ISharedPreferences prefs = Application.Context.GetSharedPreferences("Test", FileCreationMode.Private);
        prefs.GetString("Test_Data", "");

        // // Create your fragment here
    }

    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View _RD_OSBG = inflater.Inflate(Resource.Layout.RD_OSBG_Layout, container, false);


        Switch _OS_Mark = (Switch)_RD_OSBG.FindViewById(Resource.Id._OS_Mark);
        _OS_Mark.CheckedChange += (s, e) =>
        {
            if (e.IsChecked == true)
            {
                Toast.MakeText (this.Activity, "Use OS Mark", ToastLength.Short).Show();
            }
            else if (e.IsChecked == false)
            {
                Toast.MakeText (this.Activity, "Do not use OS Mark", ToastLength.Short).Show();
            }
        };


        TextView _OS_Length_Text = (TextView)_RD_OSBG.FindViewById(Resource.Id._OS_Length_Text);
        SeekBar _OS_Length = (SeekBar)_RD_OSBG.FindViewById(Resource.Id._OS_Length);
        int _Setup_OS_Length_Text = 0;
        _OS_Length_Text.Text = "OS Length : " + _Setup_OS_Length_Text + "ft";
        _OS_Length.ProgressChanged += (s, e) =>
        {
            //int _Setup_Progress = e.Progress;
            _OS_Length_Text.Text = string.Format("OS Length : " + e.Progress + "ft");
        };


        TextView _OS_Beam_Text = (TextView)_RD_OSBG.FindViewById(Resource.Id._OS_Beam_Text);
        SeekBar _OS_Beam = (SeekBar)_RD_OSBG.FindViewById(Resource.Id._OS_Beam);
        int _Setup_OS_Beam_Text = 0;
        _OS_Beam_Text.Text = "OS Beam : " + _Setup_OS_Beam_Text + "ft";
        _OS_Beam.ProgressChanged += (s, e) =>
        {
            //int _Setup_Progress = e.Progress;
            _OS_Beam_Text.Text = string.Format("OS Beam : " + e.Progress + "ft");
        };


        Switch _BG_Mark = (Switch)_RD_OSBG.FindViewById(Resource.Id._BG_Mark);
        _BG_Mark.CheckedChange += (s, e) =>
        {
            if(e.IsChecked == true)
            {
                Toast.MakeText (this.Activity, "Enable the Barge Mark", ToastLength.Short).Show();
            }
            else if(e.IsChecked == false)
            {
                Toast.MakeText (this.Activity, "Disable the Barge Mark", ToastLength.Short).Show();
            }
        };


        _BG_Position = (Spinner)_RD_OSBG.FindViewById(Resource.Id._BG_Position);
        ArrayList _BG_Position_Contents = new ArrayList { "Bow", "Stern" };
        _BG_Position.Adapter = new ArrayAdapter(this.Activity, Resource.Layout.Custom_Spinner, Resource.Id._Custom_Spinner_Text, _BG_Position_Contents);

        ISharedPreferences prefs = Application.Context.GetSharedPreferences("Test", FileCreationMode.Private);
        ISharedPreferencesEditor editor = prefs.Edit();

        _BG_Position.ItemSelected += (s, e) =>
        {
            switch(e.Position)
            {
                case 1:
                    Toast.MakeText(this.Activity, "Stern", ToastLength.Short).Show();
                    editor.PutString("Test_Data", "Stern");
                    editor.Commit();
                    break;
            }

        };


        TextView _BG_Length_Text = (TextView)_RD_OSBG.FindViewById(Resource.Id._BG_Length_Text);
        SeekBar _BG_Length = (SeekBar)_RD_OSBG.FindViewById(Resource.Id._BG_Length);
        int _Setup_BG_Length_Text = 0;
        _BG_Length_Text.Text = "BG Length : " + _Setup_BG_Length_Text + "ft";
        _BG_Length.ProgressChanged += (s, e) =>
        {
            //int _Setup_Progress = e.Progress;
            _BG_Length_Text.Text = string.Format("BG Length : " + e.Progrhess + "ft");
        };


        TextView _BG_Beam_Text = (TextView)_RD_OSBG.FindViewById(Resource.Id._BG_Beam_Text);
        SeekBar _BG_Beam = (SeekBar)_RD_OSBG.FindViewById(Resource.Id._BG_Beam);
        int _Setup_BG_Beam_Text = 0;
        _BG_Beam_Text.Text = "BG Beam : " + _Setup_BG_Beam_Text + "ft";
        _BG_Beam.ProgressChanged += (s, e) =>
        {
            //int _Setup_Progress = e.Progress;
            _BG_Beam_Text.Text = string.Format("BG Beam : " + e.Progress + "ft");
        };


        return _RD_OSBG;
    }
}