Depending on the RadHtmlChart's implementation you can use the following approaches:
- For programmatically created series items you can use the logic from the Using Multiple Custom Colors to Create Charts help article - create a static class that holds the colors, so that it can be iterated over to return the desired color according to their indexes - the index of the series can point to the index of its color.
- For a databound chart you can create an additional column in the datasource that will store the colors for the series. Then you can use the ColorField property for each series type, in order to reference this field/column. Such an example is illustrated in this demo.
Note also that since Q2 2013 SP1 RadHtmlChart has 10 built-in colors for the series for each skin.
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