Hi Manal,
You can use custom value labels for this purpose:
NChart chart = nChartControl1.Charts[0];
NBarSeries bar = new NBarSeries();
bar.Values.Add(10);
chart.Series.Add(bar);
NLinearScaleConfigurator scale = chart.Axis(StandardAxis.PrimaryY).ScaleConfigurator as NLinearScaleConfigurator;
NCustomValueLabel maxValue = new NCustomValueLabel();
maxValue.Text = "Max";
maxValue.Value = 10;
scale.CustomLabels.Add(maxValue);
scale.CreateNewLevelForCustomLabels = false;
the above code also shows how to merge the custom value labels with the automatically generated ones so that when they overlap the custom labels will show only.
Best Regards,
Nevron Support Team