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To make the width for the body of the candle chart wider, specify a larger value for the Size property like in the following code. Note, that the default value for the body width of the candle is 5.
To write code in Visual Basic
c1Chart1.ChartGroups(0).ChartData.SeriesList(0).ChartSymbolStyle.Size = 10
To write code in C#
c1Chart1.ChartGroups[0].ChartData.SeriesList[0].ChartSymbolStyle.Size = 10;