DragDrop using cursor thumbnail image

This code allows an image to be dragdrop between PictureBox1 (pb1) and PictureBox2 (pb2). This uses a cursor which becomes a thumbnail image during the drag event, of the image being dragged.

Code:

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Code:
    Dim MouseIsDown As Boolean = False

    Private Sub pb1_MouseDown(ByVal sender As System.Object, _
    ByVal e As System.Windows.Forms.MouseEventArgs) Handles pb1.MouseDown
        MouseIsDown = True
    End Sub

    Private Sub pb1_MouseMove(ByVal sender As System.Object, _
    ByVal e As System.Windows.Forms.MouseEventArgs) Handles pb1.MouseMove
        If MouseIsDown Then
            If pb1.Image Is Nothing Then Exit Sub
            pb1.DoDragDrop(pb1.Image, DragDropEffects.Move)
        Else
            MouseIsDown = False
        End If
    End Sub

    Private Sub pb1_GiveFeedback(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.GiveFeedbackEventArgs) Handles pb1.GiveFeedback
        e.UseDefaultCursors = False
        Dim myPic As New Bitmap(CType(sender, PictureBox).Image)
        cursorImage = myPic.GetThumbnailImage(25, 25, Nothing, IntPtr.Zero)
        Cursor.Current = New Cursor(CType(cursorImage, System.Drawing.Bitmap).GetHicon())
    End Sub

    Private Sub pb2_DragEnter(ByVal sender As Object, ByVal e As _
    System.Windows.Forms.DragEventArgs) Handles pb2.DragEnter
        If e.Data.GetDataPresent(DataFormats.Bitmap) Then
            If e.KeyState = 9 Then
                e.Effect = DragDropEffects.Copy
            Else
                e.Effect = DragDropEffects.Move
            End If
        Else
            e.Effect = DragDropEffects.None
        End If
    End Sub

    Private Sub pb2_DragDrop(ByVal sender As System.Object, _
    ByVal e As System.Windows.Forms.DragEventArgs) Handles pb2.DragDrop
        pb2.Image = e.Data.GetData(DataFormats.Bitmap)
    End Sub

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