GridView in Mono for Android

Main.axml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:columnWidth="90dp"
    android:numColumns="auto_fit"
    android:verticalSpacing="10dp"

    android:horizontalSpacing="10dp"
    android:stretchMode="columnWidth"
    android:gravity="center" />

Activity.cs
using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

namespace gridview
{
    [Activity(Label = "gridview", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : Activity
    {
        int count = 1;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate (bundle);

    SetContentView (Resource.Layout.Main);

    var gridview = FindViewById<GridView> (Resource.Id.gridview);
    gridview.Adapter = new ImageAdapter (this);

    gridview.ItemClick += delegate (object sender, AdapterView.ItemClickEventArgs args) {
        Toast.MakeText (this, args.Position.ToString (), ToastLength.Short).Show ();
    };
        }
        public class ImageAdapter : BaseAdapter
        {
            Context context;

            public ImageAdapter(Context c)
            {
                context = c;
            }

            public override int Count
            {
                get { return thumbIds.Length; }
            }

            public override Java.Lang.Object GetItem(int position)
            {
                return null;
            }

            public override long GetItemId(int position)
            {
                return 0;
            }

            // create a new ImageView for each item referenced by the Adapter
            public override View GetView(int position, View convertView, ViewGroup parent)
            {
                ImageView imageView;

                if (convertView == null)
                {  // if it's not recycled, initialize some attributes
                    imageView = new ImageView(context);
                    imageView.LayoutParameters = new GridView.LayoutParams(85, 85);
                    imageView.SetScaleType(ImageView.ScaleType.CenterCrop);
                    imageView.SetPadding(8, 8, 8, 8);
                }
                else
                {
                    imageView = (ImageView)convertView;
                }

                imageView.SetImageResource(thumbIds[position]);
                return imageView;
            }

            // references to our images
            int[] thumbIds = {
        Resource.Drawable.sample_2, Resource.Drawable.sample_3,
        Resource.Drawable.sample_4, Resource.Drawable.sample_5,
        Resource.Drawable.sample_6, Resource.Drawable.sample_7,
        Resource.Drawable.sample_0, Resource.Drawable.sample_1,
        Resource.Drawable.sample_2, Resource.Drawable.sample_3,
        Resource.Drawable.sample_4, Resource.Drawable.sample_5,
        Resource.Drawable.sample_6, Resource.Drawable.sample_7,
        Resource.Drawable.sample_0, Resource.Drawable.sample_1,
        Resource.Drawable.sample_2, Resource.Drawable.sample_3,
        Resource.Drawable.sample_4, Resource.Drawable.sample_5,
        Resource.Drawable.sample_6, Resource.Drawable.sample_7
    };
        }
    }
}

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