Hello Jalal Eddin,
I am not quite sure I understand the concrete problem that you have with RadChart for WinForms. That is why, I created a simple example that demonstrates how you can add series items manually. In case the following code does not help you, please provide more details on the concrete that problem you face:
ChartSeries series = new ChartSeries();
series.Type = ChartSeriesType.Line;
series.Items.Add(new ChartSeriesItem(0.2, 16));
series.Items.Add(new ChartSeriesItem(0.3, 19));
series.Items.Add(new ChartSeriesItem(0.5, 21));
series.Items.Add(new ChartSeriesItem(0.8, 23));
series.Items.Add(new ChartSeriesItem(1.2, 26));
For additional information on series items, please refer to the following help topic - http://www.telerik.com/help/winforms/chart-undestanding-radchart-elements-series-items.html
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