Visual Basic.NET - Recorrer las columnas de un grid

'Friend Function ObtenerColores(ano As Integer, mes As Integer) As DataTable

'    Dim cd As New ColorDialog()

'    Dim valorEnteroColor As Integer

'    valorEnteroColor = cd.Color.ToArgb()

'    Using con As New SqlConnection(Rutina.CadenaConexion())

'        con.Open()

'        Dim query As String = "SELECT * FROM Colores AS c WHERE ano =@ano AND id_mes =@mes"

'        Dim cmd As New SqlCommand(query, con)

'        cmd.Parameters.AddWithValue("@ano", ano)

'        cmd.Parameters.AddWithValue("@mes", mes)

'        cmd.ExecuteNonQuery()

'          Me.G_quincenaII.DataSource = Deduccion.ListQuincena_II(Me.cmbMes.EditValue, txtano.EditValue)

'    End Using

'End Function