WPF UI not being updated INotifyPropertyChanged

Hi All,

I am new to WPF, I created a sample project to learn INotifyPropertyChanged interface. But the UI did not update, I didn't known why.

Here is my code snippet:

XAML:

<Window x:Class="WpfNofifyApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfNofifyApp"
        Title="INotifyPropertyChanged Sample" Height="210" Width="400"><Grid><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="*"/></Grid.RowDefinitions><GroupBox Header="Student Information:"><Grid><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="*"/></Grid.RowDefinitions><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="2*"/></Grid.ColumnDefinitions><TextBlock Text="Student Name:"/><TextBlock Grid.Column="1" Text="{Binding Path=Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/><TextBlock Text="Student Age:" Grid.Row="1"/><TextBlock Grid.Row="1" Grid.Column="1" Text="{Binding Path=Age, UpdateSourceTrigger=PropertyChanged}"/></Grid></GroupBox><GroupBox Header="Edit Student Information:" Grid.Row="1"><Grid><Grid.RowDefinitions><RowDefinition Height="*"/><RowDefinition Height="10"/><RowDefinition Height="*"/></Grid.RowDefinitions><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="2*"/></Grid.ColumnDefinitions><TextBlock Text="Student Name:"/><TextBox x:Name="TxtName" Grid.Column="1" Text="{Binding Path=Name}" Height="25"/><TextBlock Text="Student Age:" Grid.Row="2"/><TextBox x:Name="TxtAge" Grid.Row="2" Grid.Column="1" Text="{Binding Path=Age}" Height="25"/></Grid></GroupBox></Grid></Window>

C# Code:

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            Student student = new Student("Meng-Lee", "24");
            this.DataContext = student;
        }
    }

    public class Student : INotifyPropertyChanged
    {
        private string name;
        private string age;

        public event PropertyChangedEventHandler PropertyChanged;

        public Student( string name, string age)
        {
            this.name = name;
            this.age = age;
        }

        public string Name
        {
            get { return name; }
            set 
            {
                name = value;
                OnPropertyChanged(Name);
            }
        }
        public string Age 
        {
            get 
            {
                return age; 
            }

            set 
            {
                age = value;
                OnPropertyChanged(Age);
            }
        }

        // Create the OnPropertyChanged method to raise the event 
        protected void OnPropertyChanged(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(name));
            }
        }
    }

Thanks!