NBarSeries bar = new NBarSeries();
bar.Values.Add(10); bar.Values.Add(-10);
NDataLabelStyle dls1 = new NDataLabelStyle(); dls1.ArrowLength = new NLength(10); bar.DataLabelStyles[0] = dls1;
NDataLabelStyle dls2 = new NDataLabelStyle(); dls2.ArrowLength = new NLength(-10); bar.DataLabelStyles[1] = dls2;
Best Regards,Nevron Support Team