Loading huge data in a Silverlight AutoCompleteBox

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace AutoCompeteBoxSample
{
    public partial class About : Page
    {
        public About()
        {
            InitializeComponent();
        }

        // Executes when the user navigates to this page.
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            IList<string> sourceList = new List<string>();

            for (int i = 0; i < 200000; i++)
            {
                sourceList.Add("Item-" + i);
            }

            this.acbFastLoading.FastLoadingACBItemsSource = sourceList;
        }

        private void acbFastLoading_FastLoadingACBSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            //System.Windows.MessageBox.Show("Added Item is : "+e.AddedItems[0].ToString());
        }

       
       
    }
}