Excel Chart colorize 3D bars <p>Colorzing a 3D-Bar chart with Excel and interop does not work:</p> <p>Creation of chart:</p> <pre><code>chartRange = xlsSheet.Range[xlsSheet.Cells[1, 1], xlsSheet.Cells[array.GetLength(0), array.GetLength(1)]]; chartPage.SetSourceData(chartRange, Excel.XlRowCol.xlRows); chartPage.ChartType = Excel.XlChartType.xl3DColumn; chartPage.Location(Excel.XlChartLocation.xlLocationAsNewSheet, oOpt); </code></pre> <p>Changing color:</p> <pre><code>Excel.Series series = (Excel.Series)chartPage.SeriesCollection(1); Excel.Point pt = series.Points(2); pt.Format.Fill.ForeColor.RGB = (int)Excel.XlRgbColor.rgbPink; </code></pre> <p>Problem: Nothing will change inside the chart, but there is also no error. Just showing this random colors on the bars.</p>