Hi Hong,
Yes this requirement is doable - you need to do the following:
1. Go to Chart \ Chart Areas \ Chart Area 0 \ Appearance.
2. Select Color Mode = DataPoint.
at this point the chart palette will be applied per data point (not per series) and the bar clusters will have different color. Then you need to modify the color of the second bar with custom code. To do this select the code tab and paste the following code:
using System;
using System.Drawing;
using Nevron.GraphicsCore;
using Nevron.Chart;
using Nevron.ReportingServices;
namespace MyNamespace
{
/// <summary>
/// Sample class
/// </summary>
public class MyClass
{
/// <summary>
/// Main entry point
/// </summary>
/// <param name="context"></param>
public static void RSMain(NRSChartCodeContext context)
{
NChart chart = context.document.Charts[0];
NBarSeries bar = chart.Series[1] as NBarSeries;
bar.FillStyles.Clear();
bar.BorderStyles.Clear();
bar.BorderStyle = new NStrokeStyle(0, Color.Gray);
bar.FillStyle = new NColorFillStyle(Color.Gray);
}
}
}
This code overrides the fill / border styles applied on data points from the designer and specifies another color for the bars (in this case Color.Gray).
Hope this helps - let us know if you have any questions or meet any problems.