Hi Eyon,
To specify an axis range you must change the axis view to range axis view - for exampe:
NChart chart = nChartControl1.Charts[0];
chart.Axis(StandardAxis.PrimaryY).View = new NRangeAxisView(new NRange1DD(0, 100), true, true);
nChartControl1.Refresh();
will limit the Y axis to show values in the range 0 - 100. Is this the functionality you're looking for? - or maybe you want to allow the user to also use scrolling / panning - if this is the case just let us know and we'll post code to accomplish this.
Let us know if you have any questions or meet any problems.
Best Regards,
Nevron Support Team