Hide some XAxis labels in MS chart Control in Asp.net

Hi,
I have tried to generate a chart but I can´t finish as I wish.
 serie.Points.AddXY(Convert.ToDateTime("10/07/2015", ci), Convert.ToDouble(20, ci))         serie.Points.AddXY(Convert.ToDateTime("18/07/2015", ci), Convert.ToDouble(70, ci))         serie.Points.AddXY(Convert.ToDateTime("24/07/2015", ci), Convert.ToDouble(110, ci))
Some dates before, between and after these three point ar showing, but I only want to show de dates of three points, and respect de daytime line.

The yellow squares whit dates should not be shown.
I use chart1.AxisX.Interval = 1, because in need scale day by day, but no show al labels of day.
I can not use serie.IsXValueIndexed = True to respect day by day scale.