public static void Run()
{
// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_Charts();
// Create an instance of Presentation class
Presentation presentation = new Presentation();
IChart chart = presentation.Slides[0].Shapes.AddChart(ChartType.Doughnut, 50, 50, 400, 400);
chart.ChartData.SeriesGroups[0].DoughnutHoleSize = 90;
// Write presentation to disk
presentation.Save(dataDir + "DoughnutHoleSize_out.pptx", SaveFormat.Pptx);
}
}