Private Sub Form1_Load(ByVal sender As System.Object, _
  ByVal e As System.EventArgs) Handles MyBase.Load
 
  ' PictureBox der Fenstergröße anpassen
  With Me.ClientRectangle
    PictureBox1.Location = New Point(.Left, .Top)
    PictureBox1.Size = New Size(.Width, .Height)
  End With
 
  ' Anchor-Eigenschaft festlegen
  PictureBox1.Anchor = AnchorStyles.Left Or AnchorStyles.Top Or _
    AnchorStyles.Right Or AnchorStyles.Bottom
 
  ' SizeMode der PictureBox festlegen
  ' Bild immer stecken/stauchen
  PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
End Sub

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