DataGridViewのセル背景に画像を描画する方法

DataGridViewのセル背景に画像を描画する方法
VB.NET

Private cellBackImage As New Bitmap("C:\img001.gif")

Private Sub dgv1_CellPainting(ByVal sender As Object, _
        ByVal e As DataGridViewCellPaintingEventArgs) _
        Handles dgv1.CellPainting
    If e.ColumnIndex >= 0 AndAlso e.RowIndex >= 0 AndAlso _
        (e.PaintParts And DataGridViewPaintParts.Background) = _
            DataGridViewPaintParts.Background Then
        Dim backParts As DataGridViewPaintParts = _
            e.PaintParts And (DataGridViewPaintParts.Background Or _
                DataGridViewPaintParts.SelectionBackground)
        e.Paint(e.ClipBounds, backParts)

        e.Graphics.DrawImage(cellBackImage, e.CellBounds)

        Dim paintParts As DataGridViewPaintParts = _
            e.PaintParts And Not backParts
        e.Paint(e.ClipBounds, paintParts)

        e.Handled = True
    End If
End Sub

C#

private Bitmap cellBackImage = new Bitmap("C:\\img001.gif");

private void dgv1_CellPainting(object sender,
    DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex >= 0 && e.RowIndex >= 0 &&
        (e.PaintParts & DataGridViewPaintParts.Background) ==
            DataGridViewPaintParts.Background)
    {
        DataGridViewPaintParts backParts = e.PaintParts &
            (DataGridViewPaintParts.Background |
            DataGridViewPaintParts.SelectionBackground);
        e.Paint(e.ClipBounds, backParts);

        e.Graphics.DrawImage(cellBackImage, e.CellBounds);

        DataGridViewPaintParts paintParts =
            e.PaintParts & ~backParts;
        e.Paint(e.ClipBounds, paintParts);

        e.Handled = true;
    }
}