Chart > Charts > Types > Polar > Series > Polar Line Series 
A Polar Line chart displays a sequence of data points connected by a line in a 2dimensional polar coordinate system. The position of a point is specified by its distance from the center and its rotation angle. Consecutive points are connected with straight line segments. The following image shows a polar line chart:
Polar Line series are represented by the NPolarLineSeries type. An instance of this type must be added to the series collection of a Polar chart:
C# 
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NPolarLineSeries polarLine = new NPolarLineSeries(); polarChart.Series.Add(polarLine); 
Polar Line series accept data points of type NPolarLineDataPoint. The following code snippet shows how to add data to a polar line series:
C# 
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NPolarLineDataPoint polarLineDataPoint = new NPolarLineDataPoint(); polarLineDataPoint.X = 10; polarLineDataPoint.Y = 10; polarLine.DataPoints.Add(polarLineDataPoint); 