wpf data binding: where i am going wrong? please help

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VB

WPF

i am trying wpf for the first time and with lot of research and help from Pete O'Hanlon. i was able to come to a certain point. but after binding with the class and all i am still not able to get the value to the label when it changes in the code of class

I am using VS2008 framework 3.5

<Window x:Class="Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Avenet Prduct Description Extractor" Height="396.627" Width="588.123" removed="AliceBlue" >
    <Grid Height="341.077" Width="567.721" removed="AliceBlue">

        
        <StackPanel Margin="170.225,226.418,3.143,0" Name="StackPanel1" Height="97.994" VerticalAlignment="Top">
            <Label Height="30.906" Name="lblCrntSt1" Content="{Binding PrdFrstName}" Width="161" BorderThickness="2" BorderBrush="AliceBlue" Background="Red" Foreground="White" FontSize="13"></Label>
            <Label Height="33.633" Name="lblcrntst2" Content="{Binding prdScndName}" Width="161" BorderThickness="2" BorderBrush="AliceBlue" Background="Red" Foreground="White" FontSize="13"></Label>
            <Label Height="29.997" Name="lblcrntst3" Content="{Binding prdLastName}" Width="161" BorderThickness="2" BorderBrush="AliceBlue" Background="Red" Foreground="White" FontSize="13">Label State3</Label>
        </StackPanel>
        <StackPanel Margin="0,62.216,73.348,0" Name="StackPanel2" Height="94.816" VerticalAlignment="Top" removed="Honeydew" HorizontalAlignment="Right" Width="144.43">
            <StackPanel.Resources>
                <Style TargetType="Button">
                    <Setter Property="Margin" Value="0,07,0,0"></Setter>

                </Style>

            </StackPanel.Resources>
            
        
    </Grid>
</Window>

here is the window class where it is initialized

Class Window1

    Dim clsIniti As New ExtractDetails

Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()
        'clsIniti = New ExtractDetails
        Me.DataContext = clsIniti

        ' Add any initialization after the InitializeComponent() call.

    End Sub
end class

here is my class where it all happens. this is a separate class

Public Class ExtractDetails
    Inherits UserControl
    Implements System.ComponentModel.INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
    
    Private _prdFrstName, _prdScndName, _prdLastName As String
    Private lstPdfDwn As List(Of String) = New List(Of String)
    Dim intPgeLop As Integer = 0
    Dim blnPgeLod As Boolean


#Region "Properties for Passing back the values to form"
     Public Property PrdFrstName() As String
        Get
            Return _prdFrstName
        End Get
        Set(ByVal value As String)
            If _prdFrstName <> value Then
                _prdFrstName = value
                OnPropertyChanged("PrdFrstName")
            End If
        End Set
    End Property



    Public Property prdScndName() As String
        Get
            Return _prdScndName
        End Get
        Set(ByVal value As String)
            If _prdScndName <> value Then
                _prdScndName = value
                OnPropertyChanged("prdScndName")
            End If
        End Set
    End Property

    Public Property prdLastName() As String
        Get
            Return _prdLastName
        End Get
        Set(ByVal value As String)
            If _prdLastName <> value Then
                _prdLastName = value
                OnPropertyChanged("prdLastName")
            End If
        End Set
    End Property

	Private Sub OnPropertyChanged(ByVal propertyName As String)
        	RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
    	End Sub

#End Region


 Public Sub suMainStrt(ByVal strFilePath As String)
		PrdFrstName= "http://www.lg.com"

                Call extract(webBrwFrst, strComurl(1))
                webBrwFrst.Dispose()
                webBrwFrst = Nothing
end sub

End Class

I m getting confused. please correct me. i am totally new to this WPF and MVVM
the extract function is working and i am getting all the details and every thing
i created this in windows forms and it is working great.

this is edited coed and i might have missed adding something. but i am not getting any errors as of such in my VS2008