Telerik.Reporting.Charting.ChartSeries series = new Telerik.Reporting.Charting.ChartSeries(); chart1.Series.Add(series); series.Type=Telerik.Reporting.Charting.ChartSeriesType.Line; series.Name = "My Series"; Telerik.Reporting.Charting.ChartSeriesItem item = new Telerik.Reporting.Charting.ChartSeriesItem(); item.XValue = 2; item.YValue = 35; series.AddItem(item); item = new Telerik.Reporting.Charting.ChartSeriesItem(); item.XValue = 5; item.YValue = 45; series.AddItem(item); item = new Telerik.Reporting.Charting.ChartSeriesItem(); item.XValue = 7; item.YValue = 45; series.AddItem(item); item = new Telerik.Reporting.Charting.ChartSeriesItem(); item.XValue = 8; item.YValue = 41; series.AddItem(item); item = new Telerik.Reporting.Charting.ChartSeriesItem(); item.XValue = 10; item.YValue = 35; series.AddItem(item); series.Appearance.PointMark.Dimensions.Width = 5; series.Appearance.PointMark.Dimensions.Height = 5; series.Appearance.PointMark.FillStyle.MainColor = System.Drawing.Color.Black; series.Appearance.PointMark.Visible = true;Thanks