series.ChartType = SeriesChartType.Line
series.YValueType = ChartValueType.Double
series.XValueType = ChartValueType.String
series.BorderWidth = 1
series.ShadowOffset = 1
series.IsValueShownAsLabel = True
series.ToolTip = dtrow.ToString
series.LabelForeColor = Color.Gray

series.LabelToolTip = dtrow.ToString

ChartRatings.Series.Add(series)

Chart1.Series["Series1"].SmartLabels.Enabled = true;