Chart not clearing properly c# -

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when getvalue button pressed chart behaves expected, when clearchart button pressed chart clears, numbers on x axis decimals e.g 1.99999999,2.99999999. seems x axis not being reset scroll bar @ bottom not keep right after chart cleared. how chart clear , start off @ start of program? here code. 

int i; random rnd = new random();  private void chart_load(object sender, eventargs e) { chart1.series.add("temp"); chart1.series["temp"].charttype = seriescharttype.spline; chart1.series["temp"].isvisibleinlegend = false; }  private void getvalue_click(object sender, eventargs e) {  chart1.chartareas["chartarea1"].axisx.scaleview.zoom(0, 20); chart1.chartareas["chartarea1"].axisx.scaleview.smallscrollsize = 20;  chart1.series["temp"].points.addxy(i, rnd.next(1, 10)); i++; chart1.chartareas["chartarea1"].axisx.scaleview.position = chart1.series["temp"].points.count - chart1.chartareas["chartarea1"].axisx.scaleview.size; }  private void clearchart_click(object sender, eventargs e) { chart1.series["temp"].points.clear(); }

try clearing points of chart.

add following clear handler:

chart1.series["temp"].points.clear();

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