EMA in C# language for Multicharts

Hello

I have no programming skills. I use Multicharts platform. I need help in writing formula for EMA indicator. Of course it is EMA in Multicharts but unfortunatelly only calculated for CLOSE. I need EMA for HIGH and LOW to make a channel on chart.

Below is a formula of EMA CLOSE.


using System;
using System.Drawing;
using PowerLanguage.Function;
namespace PowerLanguage.Indicator
{
[SameAsSymbol(true)]
public class Mov_Avg_Exponential : IndicatorObject
{
private XAverage m_xaverage1;
private VariableSeries<Double> m_avgexp;
private IPlotObject Plot1;
public Mov_Avg_Exponential(object ctx) :
base(ctx){
length = 9;
}
private ISeries<double> price { get; set; }
[Input]
public int length { get; set; }
[Input]
public int displace { get; set; }
protected override void Create(){
m_xaverage1 = new XAverage(this);
m_avgexp = new VariableSeries<Double>(this);
Plot1 =
AddPlot(new PlotAttributes("AvgExp", 0, Color.Blue,
Color.Empty, 0, 0, true));
}
protected override void StartCalc(){
price = Bars.Close;
m_xaverage1.Price = price;
m_xaverage1.Length = length;
}

protected override void CalcBar(){
m_avgexp.Value = m_xaverage1[0];
if (((displace >= 0)
|| Bars.CurrentBar > Math.Abs(displace))){
Plot1.Set(displace, m_avgexp.Value);
if ((displace <= 0)){
if (((PublicFunctions.DoubleGreater(price[0], m_avgexp.Value) &&
PublicFunctions.DoubleGreater(m_avgexp.Value, m_avgexp[1]))
&& PublicFunctions.DoubleLessEquals(m_avgexp[1], m_avgexp[2]))){
Alerts.Alert("Indicator turning up");
}
else{
if (((PublicFunctions.DoubleLess(price[0], m_avgexp.Value) &&
PublicFunctions.DoubleLess(m_avgexp.Value, m_avgexp[1]))
&& PublicFunctions.DoubleGreaterEquals(m_avgexp[1], m_avgexp[2]))){
Alerts.Alert("Indicator turning down");
}
}
}
}
}
}
}