Hi Irina,
You can achieve this with the help of a second point series that has data points offset by 0,5 from the line series points. For example:
NChart chart = nChartControl1.Charts[0];
NStepLineSeries line = new NStepLineSeries();
line.DataLabelStyle.Visible = false;
line.Values.Add(10);
line.Values.Add(20);
line.Values.Add(30);
chart.Series.Add(line);
NPointSeries point = new NPointSeries();
point.Size = new Nevron.GraphicsCore.NLength(0);
point.UseXValues = true;
for (int i = 0; i < line.Values.Count - 1; i++)
{
point.Values.Add(line.Values[i]);
point.XValues.Add(i + 0.5);
}
chart.Series.Add(point);
Hope this helps - let us know if you meet any problems.