Hi Manal,
Yes it is possible to restrict the range of any axis in the control. Since date times in Nevron Chart are internally represented by double values (their OA equivalent) you need to convert the start / end date time to OA Date Time format. The following code shows how to do that:

DateTime dtEnd = DateTime.Now;
DateTime dtBegin = dtEnd - new TimeSpan(12, 0, 0);

chart.Axis(StandardAxis.PrimaryX).View = new NRangeAxisView(new NRange1DD(dtBegin.ToOADate(), dtEnd.ToOADate()), true, true);

Hope this helps - let us know if you meet any problems or have any questions.