Mobile

[Activity(Label = "Country List", MainLauncher = true)]
    public class MyListViewActivity : Activity
    {
        List<string> countries = new List<string>();
        ArrayAdapter<string> adapter;
        ListView lvw;
        
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            
            SetContentView(Resource.Layout.ListviewLayout);
            InitCounties();
                                                
            lvw = FindViewById<ListView>(Resource.Id.lvwCountry);
            EditText txtMsg = FindViewById<EditText>(Resource.Id.edit_text_out);
            Button btnSend = FindViewById<Button>(Resource.Id.button_send);

            adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, countries);
            lvw.Adapter = adapter;
            lvw.TextFilterEnabled = true;
            lvw.FastScrollEnabled = true;

            btnSend.Click += delegate(object sender, EventArgs e)
            {
                addItems(txtMsg.Text);
            };
        }
     }

void InitCounties()
{
        countries.Add("Philippines");
        countries.Add("USA");
        countries.Add("Hong Kong");
        countries.Add("Singapore");
        countries.Add("Russia");
        countries.Add("Afghanistan");
        countries.Add("Albania");
        countries.Add("Algeria");
        countries.Add("American Samoa");
	countries.Add("Andorra");
}

public void addItems(string newItem)
{
     counties.Add(newItem);
     adapter.NotifyDataSetChanged();
}