GetVolume()

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protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
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{
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   base.OnRender(chartControl, chartScale);
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   // loop through all the rendered bars on the chart
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   for(int barIndex = ChartBars.FromIndex; barIndex <= ChartBars.ToIndex; barIndex++)
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   {
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     // get the volume value at the selected bar index value
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     long volumeValue = Bars.GetVolume(barIndex);
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     Print("Bar #" + barIndex + " volume value is " + volumeValue);
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   }
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}