New to VB.NET - How can I add line numbers to DataGridView rows using VB.NET?

I attempted to use this code posted out on the Internet but it said that "CellStyle" was not a member of the "DataGridViewRowPostPaintEventArgs" Class. It looked great but than no cigar when I even discovered that "CellStyle" was not a member on Microsofts site. I've attempted to try and find the classes that would allow me to code this myself but am overwhelmed by the tons of classes available. I am a Beginning VB.NET programmer. Any assistance would be appreciated

Private Sub dataGridView1_RowPostPaint(ByVal sender As Object, _
  ByVal e As DataGridViewRowPostPaintEventArgs) _
    Handles dataGridView1.RowPostPaint
  ' Paint the row number on the row header.
  ' The using statement automatically disposes the brush.
  Using b As SolidBrush = _
    New SolidBrush(dataGridView1.RowHeadersDefaultCellStyle.ForeColor)
  e.Graphics.DrawString( _
    e.RowIndex.ToString(System.Globalization.CultureInfo.CurrentUICulture), _
    e.CellStyle.Font, _
    b, _
    e.RowBounds.Location.X + 20, _
    e.RowBounds.Location.Y + 4)
End Using
End Sub

Thank you,

Wallace

wallace.davis@bankofamerica.com