Thank you for writing.
1. You can change the line thickness and color by changing the BorderColor
RadarLineSeries series =
series.BorderColor = Color.DarkKhaki;
series.BorderWidth = 5;
2. If you want to change the grid lines color you can just set the grids ForeColor property:
PolarGrid grid =
grid.ForeColor = Color.Red;
However you cannot set different color for each line. In this case I want to suggest you to set some custom background to the chart:
radChartView1.ChartElement.Image = Image.FromFile(@
Please let me know if there is something else I can help you with.
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