Stacked Bar charts are displayed with several NBarSeries objects. The MultiBarMode property of the first bar series must be set to MultiBarMode.Series. The MultiBarMode property of the subsequent bar series must be set to MultiBarMode.Stacked. The following example demonstrates how to create a stack bar chart with two stacks:

// obtain a reference to the Cartesian chart that is created by default
NCartesianChart chart = (NCartesianChart)chartControl.Charts[0];

NBarSeries bar1 = (NBarSeries)chart.Series.Add(SeriesType.Bar);
NBarSeries bar2 = (NBarSeries)chart.Series.Add(SeriesType.Bar);

bar1.MultiBarMode = MultiBarMode.Series;
bar2.MultiBarMode = MultiBarMode.Stacked;

' obtain a reference to the Cartesian chart that is created by default
Dim chart As NCartesianChart = chartControl.Charts(0)

Dim bar1 As NBarSeries = chart.Series.Add(SeriesType.Bar)
Dim bar2 As NBarSeries = chart.Series.Add(SeriesType.Bar)

bar1.MultiBarMode = MultiBarMode.Series
bar2.MultiBarMode = MultiBarMode.Stacked

If you want to create a second stacked bar with two stacks behind the stack bar created in the previous sample you have to add the following code:

NBarSeries bar4 = (NBarSeries)chart.Series.Add(SeriesType.Bar);
NBarSeries bar5 = (NBarSeries)chart.Series.Add(SeriesType.Bar);

bar4.MultiBarMode = MultiBarMode.Series;
bar5.MultiBarMode = MultiBarMode.Stacked;

Dim bar4 As NBarSeries = chart.Series.Add(SeriesType.Bar)
Dim bar5 As NBarSeries = chart.Series.Add(SeriesType.Bar)

bar4.MultiBarMode = MultiBarMode.Series
bar5.MultiBarMode = MultiBarMode.Stacked

Stacked bar charts support negative values, which means that if you insert negative values in the Values data series the respective stacks will be piled below the zero. In this case since the values for a certain category can be both positive and negative the chart will display two piles for each category - one for the positive values which grows above the zero and another one for the negative values which grows below the zero.

The following figure demonstrates a typical stack bar chart with negative and positive values:

figure 2.

The following formatting commands inherited from the NSeries class have different meaning when a bar series is stacked:

<total> - displays the positive or negative values sum of the values in the current stack. If the current value is negative the negative sum is displayed otherwise the positive sum is displayed.
<cumulative> - displays the sum of the values up to the current stack value.
<percent> - displays the percent contribution of the value to the total pile sum.