Data Binding(2)

public class Employee : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private string _name;
        public String Name 
        {
            set 
            {
                _name = value;
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("Name"));
                }
            }
            get 
            {
                return _name;
            }
        }
        public DateTime BirthDay { set; get; }
        public Byte Gender { set; get; }

        public override string ToString()
        {
           return String.Format("Name:{0}, Birth of Day :{1}, Gender:{2}",Name, BirthDay.ToLongDateString(), Gender == 1? "Male":"Female");
        }
        
    }

public partial class MainPage : UserControl
    {
        public List<Employee> EmployeeList = new List<Employee>();
        public MainPage()
        {
            InitializeComponent();
            EmployeeList.Add(new Employee() { BirthDay = new DateTime(1984, 06, 28), Gender = 1, Name = "Mo.Li" });
            EmployeeList.Add(new Employee() { BirthDay = new DateTime(1985, 06, 06), Gender = 1, Name = "Jerry" });
            EmployeeList.Add(new Employee() { BirthDay = new DateTime(1985, 06, 06), Gender = 1, Name = "Moon.Li" });
            this.myComboBox.ItemsSource = EmployeeList;
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            foreach(Employee p in EmployeeList)
            {
                p.Name += "_Update";
            }
        }
    }

<Grid x:Name="LayoutRoot" Background="White">
            <ComboBox Name="myComboBox" Width="350" Height="35" Background="Red">
                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Width="350" Height="35" Background="Yellow" Orientation="Horizontal">
                            <TextBlock Text="{Binding Name, Mode=TwoWay}" Foreground="Green" FontFamily="Georgia"></TextBlock>
                            <TextBlock Text="{Binding BirthDay}" Foreground="Green" FontFamily="Georgia"></TextBlock>
                            <TextBlock Text="{Binding Gender}" Foreground="Green" FontFamily="Georgia"></TextBlock>
                        </StackPanel>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            <Button Margin="26,98,304,172" Content="Update" Height="30" Width="70" FontSize="14" Foreground="LightBlue" Click="Button_Click"></Button>
        </Grid>