Binding the second data of a list to the textproperty of textbox

I defined a textbox and a list, the list has two data, every data has three properties named "Name", "Age" and "Sex". I want the bindind  the "Name" of the second data of the list to the textproperty of the textbox, so I write some code like following :

VB code:
Imports System.ComponentModel
Imports System.Collections.ObjectModel
Class Window1
    Public MyPerson As New ObservableCollection(Of Person)
Sub New()
         InitializeComponent()
         MyPerson.Add(New Person("Jackson", 32, "Boy"))
        MyPerson.Add(New Person("Mike", 21, "Girl"))
        Dim MyBinding As New Binding("MyPerson[1]/Name")
        MyBinding.Source = MyPerson
        'MyBinding.Path = MyPerson
        MyBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
        txb.SetBinding(TextBox.TextProperty, MyBinding)
    End Sub
End Class
Public Class Person
    Implements INotifyPropertyChanged
    Private _Name As String
    Private _Age As Integer
    Private _Sex As String
    Public Property Name() As String
        Get
            Return _Name
        End Get
        Set(ByVal value As String)
            _Name = value
            Me.OnPropertyChanged("Name")
        End Set
    End Property
Public Property Age() As Integer
        Get
            Return _Age
        End Get
        Set(ByVal value As Integer)
            _Age = value
            Me.OnPropertyChanged("Age")
        End Set
    End Property
Sub New(ByVal _Name As String, ByVal _Age As Integer, ByVal _Sex As String)
        Me._Name = _Name
        Me._Age = _Age
        Me._Sex = _Sex
    End Sub
    Public Sub OnPropertyChanged(ByVal Info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(Info))
    End Sub
    Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged
End Class

Xaml Code：
<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <TextBox Name="txb"></TextBox>
    </Grid>
</Window>

So the question is that if I want to binding the "Name" property of data ("Mike", 21, "Girl")  to the textpropery of the textbox, how should I change the code " Dim MyBinding As New Binding("MyPerson[1]/Name")"? Shold anybody give me some advice? Thank you !