Using ListBox in Silverlight

First,

Create aclass called Person
  public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Age { get; set; }
    }
 Then, in xaml,
<ListBox x:Name="lbPeople" Grid.Row="0" Grid.Column="0"  Height="250" Width="300" HorizontalAlignment="Left"
                              ScrollViewer.HorizontalScrollBarVisibility="Hidden" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="100" />
                            <ColumnDefinition Width="100" />
                            <ColumnDefinition Width="100" />
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Margin="10" Text="{Binding FirstName}" />
                        <TextBlock Grid.Column="1" Margin="10" Text="{Binding LastName}" />
                        <TextBlock Grid.Column="2" Margin="10" Text="{Binding Age}" />
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

In C# code,
   void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            lbPeople.ItemsSource = GetPeople();
        }

        public List<Person> GetPeople()
        {
            string[] firstNames = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11" };
            string[] lastNames = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11" };
            List<Person> people = new List<Person>();
            Random r2 = new Random();
            Random r = new Random();
            for (int i = 0; i < 10; i++)
            {
                int index = r.Next(0, 11);
                Person p = new Person
                {
                    FirstName = firstNames[index],
                    LastName = lastNames[index],
                    Age = r2.Next(10, 90)
                };
                people.Add(p);
            }
            return people;
        }