c# - How to control the x-axis in ms chart control time-wise? -

i'm reading data serial port , displaying in ms-chart control. don't know have in chart area 5 vertical bars in total (1 second apart) -> total of 5 seconds data in chart area , have no. of seconds displayed on x axis.

`       timer = new timer();         timer.tick += timer_tick;         timer.interval = 100;         chart1.chartareas[0].axisy.maximum = 1024;         chart1.chartareas["chartarea1"].axisy.majorgrid.enabled = false;            private void timer_tick(object sender, eventargs e)         {             string data;             data = _port.readexisting();              var datablocks = data.split('\n');             foreach (var block in datablocks)             {               var numbers = block.split(new [] {' '}, stringsplitoptions.removeemptyentries);               (int = 0; < numbers.length; i++)               {                 double n = double.nan;                 bool ok = double.tryparse(numbers[i], out n);                 if (ok)                 {                     if (n > 30)                     {                         chart1.series[i].points.addxy(x, n);                         if (chart1.series[0].points.count > 700)                             chart1.series[0].points.removeat(0);                     }                 }                                }              }                    }`