Why is my data binding not working? (WPF/vb.net) - wpf

Question

I want to bind each property of my class "Artikelstammdaten" to a textbox, but my textbox stays empty. This is what the class looks like:
Public Class Artikelstammdaten
Private _Artikel As String
Private _BezeichnungDE As String
Private _BezeichnungEN As String
Private _Einheit As String
Private _MatGrp As String
Private _Kostenart As Integer
Private _Vertriebstext_DE As String
Private _Vertriebstext_EN As String
Private _Stuecklistennummer As String
Private _Status As String
Private _Klasse As String
Private _Mantelflaeche As Double
Private _Gewicht As Double
Private _KlasseID As String
Private _Stueckliste As IList(Of Stueckliste)
Private _Arbeitsgaenge As IList(Of Arbeitsgaenge)
Public Property Artikel As String
Get
Return _Artikel
End Get
Set
_Artikel = Value
End Set
End Property
Public Property BezeichnungDE As String
Get
Return _BezeichnungDE
End Get
Set
_BezeichnungDE = Value
End Set
End Property
Public Property BezeichnungEN As String
Get
Return _BezeichnungEN
End Get
Set
_BezeichnungEN = Value
End Set
End Property
Public Property Einheit As String
Get
Return _Einheit
End Get
Set
_Einheit = Value
End Set
End Property
Public Property MatGrp As String
Get
Return _MatGrp
End Get
Set
_MatGrp = Value
End Set
End Property
Public Property Kostenart As Integer
Get
Return _Kostenart
End Get
Set
_Kostenart = Value
End Set
End Property
Public Property Vertriebstext_DE As String
Get
Return _Vertriebstext_DE
End Get
Set
_Vertriebstext_DE = Value
End Set
End Property
Public Property Vertriebstext_EN As String
Get
Return _Vertriebstext_EN
End Get
Set
_Vertriebstext_EN = Value
End Set
End Property
Public Property Stuecklistennummer As String
Get
Return _Stuecklistennummer
End Get
Set
_Stuecklistennummer = Value
End Set
End Property
Public Property Status As String
Get
Return _Status
End Get
Set
_Status = Value
End Set
End Property
Public Property Klasse As String
Get
Return _Klasse
End Get
Set
_Klasse = Value
End Set
End Property
Public Property Mantelflaeche As Double
Get
Return _Mantelflaeche
End Get
Set
_Mantelflaeche = Value
End Set
End Property
Public Property Gewicht As Double
Get
Return _Gewicht
End Get
Set
_Gewicht = Value
End Set
End Property
Public Property KlasseID As String
Get
Return _KlasseID
End Get
Set
_KlasseID = Value
End Set
End Property
Public Property Stueckliste As IList(Of Stueckliste)
Get
Return _Stueckliste
End Get
Set
_Stueckliste = Value
End Set
End Property
Public Property Arbeitsgaenge As IList(Of Arbeitsgaenge)
Get
Return _Arbeitsgaenge
End Get
Set
_Arbeitsgaenge = Value
End Set
End Property
End Class
I'm using a ViewModel where i implement the INotifyChanged Interface:
Public Class ArtikelstammdatenViewModel
Implements INotifyPropertyChanged
Private _ArtikelstammdatenList As List(Of Artikelstammdaten)
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Public Property ArtikelstammdatenList As List(Of Artikelstammdaten)
Get
Return _ArtikelstammdatenList
End Get
Set
_ArtikelstammdatenList = Value
NotifyPropertyChanged("ArtikelstammdatenList")
End Set
End Property
Private Sub NotifyPropertyChanged(ByVal info As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
End Sub
End Class
I'm initializing an object in the MainWindow and fill it with data, which should bind to "EditArtikelstammdaten.xaml"
Dim asd As New Artikelstammdaten
With asd
.Artikel = "VAUBEF0010"
.BezeichnungDE = "Sammelbandantrieb"
.BezeichnungEN = "Collection Belt Drive N50"
.Einheit = "STK"
.MatGrp = "VAU"
.Kostenart = 1500
.Vertriebstext_DE = "Antrieb Umlenkungen"
.Vertriebstext_EN = "Drive, Deflections"
.Stuecklistennummer = "VAUBEF0010"
.Status = "F"
.Klasse = "VTPIMV"
.Mantelflaeche = 1.3
.Gewicht = 120
.KlasseID = "1.2.6.5"
End With
I used "Artikelstammdaten" as DataContext and finally bind each Property to the text Properites.
<Window.DataContext>
<local:Artikelstammdaten></local:Artikelstammdaten>
</Window.DataContext>
<TextBox x:Name="txtItem"
Text="{Binding Artikel}"
Grid.Column="2"
Grid.Row="1"
Margin="0, 5, 0, 8"
FontSize="13"
></TextBox>
What am i missing or doing wrong? Thank you for your time!